pktgen: speedup fragmented skbs
We spend lot of time clearing pages in pktgen. (Or not clearing them on ipv6 and leaking kernel memory) Since we dont modify them, we can use one zeroed page, and get references on it. This page can use NUMA affinity as well. Define pktgen_finalize_skb() helper, used both in ipv4 and ipv6 Results using skbs with one frag : Before patch : Result: OK: 608980458(c608978520+d1938) nsec, 1000000000 (100byte,1frags) 1642088pps 1313Mb/sec (1313670400bps) errors: 0 After patch : Result: OK: 345285014(c345283891+d1123) nsec, 1000000000 (100byte,1frags) 2896158pps 2316Mb/sec (2316926400bps) errors: 0 Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
David S. Miller
parent
672bda3370
commit
26ad787962
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@ -251,6 +251,7 @@ struct pktgen_dev {
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int max_pkt_size; /* = ETH_ZLEN; */
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int pkt_overhead; /* overhead for MPLS, VLANs, IPSEC etc */
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int nfrags;
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struct page *page;
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u64 delay; /* nano-seconds */
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__u64 count; /* Default No packets to send */
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@ -1134,6 +1135,10 @@ static ssize_t pktgen_if_write(struct file *file,
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if (node_possible(value)) {
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pkt_dev->node = value;
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sprintf(pg_result, "OK: node=%d", pkt_dev->node);
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if (pkt_dev->page) {
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put_page(pkt_dev->page);
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pkt_dev->page = NULL;
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}
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}
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else
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sprintf(pg_result, "ERROR: node not possible");
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@ -2605,6 +2610,90 @@ static inline __be16 build_tci(unsigned int id, unsigned int cfi,
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return htons(id | (cfi << 12) | (prio << 13));
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}
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static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
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int datalen)
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{
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struct timeval timestamp;
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struct pktgen_hdr *pgh;
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pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
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datalen -= sizeof(*pgh);
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if (pkt_dev->nfrags <= 0) {
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pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
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memset(pgh + 1, 0, datalen);
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} else {
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int frags = pkt_dev->nfrags;
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int i, len;
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if (frags > MAX_SKB_FRAGS)
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frags = MAX_SKB_FRAGS;
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len = datalen - frags * PAGE_SIZE;
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if (len > 0) {
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memset(skb_put(skb, len), 0, len);
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datalen = frags * PAGE_SIZE;
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}
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i = 0;
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while (datalen > 0) {
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if (unlikely(!pkt_dev->page)) {
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int node = numa_node_id();
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if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
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node = pkt_dev->node;
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pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
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if (!pkt_dev->page)
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break;
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}
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skb_shinfo(skb)->frags[i].page = pkt_dev->page;
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get_page(pkt_dev->page);
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skb_shinfo(skb)->frags[i].page_offset = 0;
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skb_shinfo(skb)->frags[i].size =
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(datalen < PAGE_SIZE ? datalen : PAGE_SIZE);
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datalen -= skb_shinfo(skb)->frags[i].size;
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skb->len += skb_shinfo(skb)->frags[i].size;
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skb->data_len += skb_shinfo(skb)->frags[i].size;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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while (i < frags) {
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int rem;
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if (i == 0)
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break;
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rem = skb_shinfo(skb)->frags[i - 1].size / 2;
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if (rem == 0)
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break;
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skb_shinfo(skb)->frags[i - 1].size -= rem;
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skb_shinfo(skb)->frags[i] =
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skb_shinfo(skb)->frags[i - 1];
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get_page(skb_shinfo(skb)->frags[i].page);
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skb_shinfo(skb)->frags[i].page =
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skb_shinfo(skb)->frags[i - 1].page;
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skb_shinfo(skb)->frags[i].page_offset +=
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skb_shinfo(skb)->frags[i - 1].size;
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skb_shinfo(skb)->frags[i].size = rem;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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}
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/* Stamp the time, and sequence number,
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* convert them to network byte order
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*/
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pgh->pgh_magic = htonl(PKTGEN_MAGIC);
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pgh->seq_num = htonl(pkt_dev->seq_num);
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do_gettimeofday(×tamp);
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pgh->tv_sec = htonl(timestamp.tv_sec);
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pgh->tv_usec = htonl(timestamp.tv_usec);
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}
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static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
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struct pktgen_dev *pkt_dev)
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{
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@ -2613,7 +2702,6 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
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struct udphdr *udph;
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int datalen, iplen;
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struct iphdr *iph;
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struct pktgen_hdr *pgh = NULL;
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__be16 protocol = htons(ETH_P_IP);
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__be32 *mpls;
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__be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */
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@ -2729,76 +2817,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
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pkt_dev->pkt_overhead);
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skb->dev = odev;
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skb->pkt_type = PACKET_HOST;
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if (pkt_dev->nfrags <= 0) {
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pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
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memset(pgh + 1, 0, datalen - sizeof(struct pktgen_hdr));
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} else {
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int frags = pkt_dev->nfrags;
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int i, len;
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pgh = (struct pktgen_hdr *)(((char *)(udph)) + 8);
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if (frags > MAX_SKB_FRAGS)
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frags = MAX_SKB_FRAGS;
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if (datalen > frags * PAGE_SIZE) {
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len = datalen - frags * PAGE_SIZE;
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memset(skb_put(skb, len), 0, len);
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datalen = frags * PAGE_SIZE;
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}
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i = 0;
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while (datalen > 0) {
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struct page *page = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
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skb_shinfo(skb)->frags[i].page = page;
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skb_shinfo(skb)->frags[i].page_offset = 0;
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skb_shinfo(skb)->frags[i].size =
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(datalen < PAGE_SIZE ? datalen : PAGE_SIZE);
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datalen -= skb_shinfo(skb)->frags[i].size;
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skb->len += skb_shinfo(skb)->frags[i].size;
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skb->data_len += skb_shinfo(skb)->frags[i].size;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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while (i < frags) {
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int rem;
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if (i == 0)
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break;
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rem = skb_shinfo(skb)->frags[i - 1].size / 2;
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if (rem == 0)
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break;
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skb_shinfo(skb)->frags[i - 1].size -= rem;
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skb_shinfo(skb)->frags[i] =
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skb_shinfo(skb)->frags[i - 1];
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get_page(skb_shinfo(skb)->frags[i].page);
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skb_shinfo(skb)->frags[i].page =
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skb_shinfo(skb)->frags[i - 1].page;
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skb_shinfo(skb)->frags[i].page_offset +=
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skb_shinfo(skb)->frags[i - 1].size;
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skb_shinfo(skb)->frags[i].size = rem;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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}
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/* Stamp the time, and sequence number,
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* convert them to network byte order
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*/
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if (pgh) {
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struct timeval timestamp;
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pgh->pgh_magic = htonl(PKTGEN_MAGIC);
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pgh->seq_num = htonl(pkt_dev->seq_num);
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do_gettimeofday(×tamp);
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pgh->tv_sec = htonl(timestamp.tv_sec);
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pgh->tv_usec = htonl(timestamp.tv_usec);
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}
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pktgen_finalize_skb(pkt_dev, skb, datalen);
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#ifdef CONFIG_XFRM
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if (!process_ipsec(pkt_dev, skb, protocol))
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@ -2980,7 +2999,6 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
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struct udphdr *udph;
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int datalen;
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struct ipv6hdr *iph;
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struct pktgen_hdr *pgh = NULL;
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__be16 protocol = htons(ETH_P_IPV6);
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__be32 *mpls;
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__be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */
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@ -3083,75 +3101,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
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skb->dev = odev;
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skb->pkt_type = PACKET_HOST;
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if (pkt_dev->nfrags <= 0)
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pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
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else {
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int frags = pkt_dev->nfrags;
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int i;
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pgh = (struct pktgen_hdr *)(((char *)(udph)) + 8);
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if (frags > MAX_SKB_FRAGS)
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frags = MAX_SKB_FRAGS;
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if (datalen > frags * PAGE_SIZE) {
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skb_put(skb, datalen - frags * PAGE_SIZE);
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datalen = frags * PAGE_SIZE;
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}
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i = 0;
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while (datalen > 0) {
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struct page *page = alloc_pages(GFP_KERNEL, 0);
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skb_shinfo(skb)->frags[i].page = page;
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skb_shinfo(skb)->frags[i].page_offset = 0;
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skb_shinfo(skb)->frags[i].size =
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(datalen < PAGE_SIZE ? datalen : PAGE_SIZE);
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datalen -= skb_shinfo(skb)->frags[i].size;
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skb->len += skb_shinfo(skb)->frags[i].size;
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skb->data_len += skb_shinfo(skb)->frags[i].size;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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while (i < frags) {
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int rem;
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if (i == 0)
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break;
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rem = skb_shinfo(skb)->frags[i - 1].size / 2;
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if (rem == 0)
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break;
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skb_shinfo(skb)->frags[i - 1].size -= rem;
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skb_shinfo(skb)->frags[i] =
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skb_shinfo(skb)->frags[i - 1];
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get_page(skb_shinfo(skb)->frags[i].page);
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skb_shinfo(skb)->frags[i].page =
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skb_shinfo(skb)->frags[i - 1].page;
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skb_shinfo(skb)->frags[i].page_offset +=
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skb_shinfo(skb)->frags[i - 1].size;
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skb_shinfo(skb)->frags[i].size = rem;
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i++;
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skb_shinfo(skb)->nr_frags = i;
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}
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}
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/* Stamp the time, and sequence number,
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* convert them to network byte order
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* should we update cloned packets too ?
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*/
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if (pgh) {
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struct timeval timestamp;
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pgh->pgh_magic = htonl(PKTGEN_MAGIC);
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pgh->seq_num = htonl(pkt_dev->seq_num);
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do_gettimeofday(×tamp);
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pgh->tv_sec = htonl(timestamp.tv_sec);
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pgh->tv_usec = htonl(timestamp.tv_usec);
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}
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/* pkt_dev->seq_num++; FF: you really mean this? */
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pktgen_finalize_skb(pkt_dev, skb, datalen);
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return skb;
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}
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@ -3884,6 +3834,8 @@ static int pktgen_remove_device(struct pktgen_thread *t,
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free_SAs(pkt_dev);
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#endif
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vfree(pkt_dev->flows);
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if (pkt_dev->page)
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put_page(pkt_dev->page);
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kfree(pkt_dev);
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return 0;
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}
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