From: Stefan Raspl Date: Mon, 21 Jan 2013 02:30:23 +0000 (+0000) Subject: qeth: Fix HiperSockets performance regression X-Git-Tag: v3.9-rc1~139^2~307^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0fa81cd49da84965ee01288b429a69a2ffd0bc5d;p=platform%2Fkernel%2Flinux-stable.git qeth: Fix HiperSockets performance regression 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 Signed-off-by: Frank Blaschka Signed-off-by: David S. Miller --- diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 3535b13..0d8cdff 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -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) {