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qeth: Fix HiperSockets performance regression

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Commit 46d3ceab "tcp: TCP Small Queues" has severly degraded
performance for single connection RR workloads on HiperSockets with
MTU >=16K due to a conflict of the TCP Small Queues approach with our
buffer scan threshold which releases buffers not frequently enough yet.
This fix restores performance to the same level as before cited commit.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Raspl 2013-01-21 02:30:23 +00:00 committed by David S. Miller
parent 819dc537fd
commit 0fa81cd49d
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/net/qeth_core_main.c
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@ -4700,7 +4700,7 @@ static int qeth_qdio_establish(struct qeth_card *card)
init_data.output_sbal_addr_array = (void **) out_sbal_ptrs;
init_data.output_sbal_state_array = card->qdio.out_bufstates;
init_data.scan_threshold =
(card->info.type == QETH_CARD_TYPE_IQD) ? 8 : 32;
(card->info.type == QETH_CARD_TYPE_IQD) ? 1 : 32;
if (atomic_cmpxchg(&card->qdio.state, QETH_QDIO_ALLOCATED,
QETH_QDIO_ESTABLISHED) == QETH_QDIO_ALLOCATED) {