From 473319af2ddd055882837990f362af2766fc9767 Mon Sep 17 00:00:00 2001 From: Stefan Raspl Date: Mon, 21 Jan 2013 02:30:23 +0000 Subject: [PATCH] qeth: Fix HiperSockets performance regression Commit 6475c397 "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 --- drivers/s390/net/qeth_core_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 3535b134bd317..0d8cdff818139 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) { -- 2.39.5