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authorStefan Raspl <raspl@linux.vnet.ibm.com>2013-01-21 03:30:23 +0100
committerDavid S. Miller <davem@davemloft.net>2013-01-21 19:51:15 +0100
commit0fa81cd49da84965ee01288b429a69a2ffd0bc5d (patch)
tree4c6a384dc7de43d68001f465b2d55887b79c2c3e /drivers/s390
parentqeth: Make s390dbf card entries persistent (diff)
downloadlinux-0fa81cd49da84965ee01288b429a69a2ffd0bc5d.tar.xz
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.c2
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) {