[PATCH] iscsi-target: Bump default TCP listen backlog to 256

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Nicholas A. Bellinger

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Sep 9, 2013, 7:26:11 PM9/9/13
to target-devel, Nicholas Bellinger
From: Nicholas Bellinger <n...@linux-iscsi.org>

This patch bumps the default TCP listen backlog within iscsit_setup_np()
from 5 to 256, in order to reduce the overall latency caused by a small
backlog with 100's of simultaneous login attempts directed to the same
single network portal.

Also add a ISCSIT_TCP_BACKLOG macro in iscsi_target_core.h.

Signed-off-by: Nicholas Bellinger <n...@linux-iscsi.org>
---
drivers/target/iscsi/iscsi_target_core.h | 1 +
drivers/target/iscsi/iscsi_target_login.c | 2 +-
2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index f6ff257..1e84f6f 100644
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -19,6 +19,7 @@
#define WHITE_SPACE " \t\v\f\n\r"
#define ISCSIT_MIN_TAGS 16
#define ISCSIT_EXTRA_TAGS 8
+#define ISCSIT_TCP_BACKLOG 256

/* struct iscsi_node_attrib sanity values */
#define NA_DATAOUT_TIMEOUT 3
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index d903c0c..5f9248d 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -873,7 +873,7 @@ int iscsit_setup_np(
struct __kernel_sockaddr_storage *sockaddr)
{
struct socket *sock = NULL;
- int backlog = 5, ret, opt = 0, len;
+ int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;

switch (np->np_network_transport) {
case ISCSI_TCP:
--
1.7.2.5

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