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| author | Stefan Raspl <raspl@linux.vnet.ibm.com> | 2013-01-21 02:30:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-01-21 13:51:15 -0500 |
| commit | 0fa81cd49da84965ee01288b429a69a2ffd0bc5d (patch) | |
| tree | 4c6a384dc7de43d68001f465b2d55887b79c2c3e /drivers/s390 | |
| parent | 819dc537fd7fcd799c5f7f85693d29e2635a84f9 (diff) | |
| download | linux-0fa81cd49da84965ee01288b429a69a2ffd0bc5d.tar.gz linux-0fa81cd49da84965ee01288b429a69a2ffd0bc5d.tar.bz2 linux-0fa81cd49da84965ee01288b429a69a2ffd0bc5d.zip | |
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 <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/net/qeth_core_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 3535b134bd31..0d8cdff81813 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) { |