From: frank.blaschka@de.ibm.com
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, linux-s390@vger.kernel.org,
Stefan Raspl <raspl@linux.vnet.ibm.com>
Subject: [patch 6/6] [PATCH] qeth: Fix HiperSockets performance regression
Date: Mon, 21 Jan 2013 13:30:23 +0100 [thread overview]
Message-ID: <20130121123037.755818924@de.ibm.com> (raw)
In-Reply-To: 20130121123017.240686588@de.ibm.com
[-- Attachment #1: 605-qeth-hipersocket-performance.diff --]
[-- Type: text/plain, Size: 1120 bytes --]
From: Stefan Raspl <raspl@linux.vnet.ibm.com>
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>
---
drivers/s390/net/qeth_core_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 qe
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) {
next prev parent reply other threads:[~2013-01-21 12:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-21 12:30 [patch 0/6] s390: network patches for net-next frank.blaschka
2013-01-21 12:30 ` [patch 1/6] [PATCH] qeth: Fix retry logic in hardsetup frank.blaschka
2013-01-21 12:30 ` [patch 2/6] [PATCH] qeth: Remove unused exports frank.blaschka
2013-01-21 12:30 ` [patch 3/6] [PATCH] qeth: Support VEPA mode frank.blaschka
2013-01-21 12:30 ` [patch 4/6] [PATCH] qeth: Update Kconfig wording frank.blaschka
2013-01-21 12:30 ` [patch 5/6] [PATCH] qeth: Make s390dbf card entries persistent frank.blaschka
2013-01-21 12:30 ` frank.blaschka [this message]
2013-01-21 18:52 ` [patch 0/6] s390: network patches for net-next David Miller
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