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authorLars Ellenberg <lars.ellenberg@linbit.com>2010-05-25 14:23:57 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-06-01 11:12:27 +0200
commit344fa462e3246bd102059ccc3c59deef416676dd (patch)
tree1e66ef2ce11d25214004468d16bac6b7a1dc24c6 /drivers/block
parentdrbd: Revert "drbd: Create new current UUID as late as possible" (diff)
downloadlinux-344fa462e3246bd102059ccc3c59deef416676dd.tar.xz
linux-344fa462e3246bd102059ccc3c59deef416676dd.zip
drbd: improve network latency, TCP_QUICKACK
On Thu, Apr 29, 2010 at 04:00:50PM -0400, Eduard.Guzovsky@stratus.com wrote on drbd-dev@lists.linbit.com Subject: [Drbd-dev] DRBD small synchronous writes performance improvements > 1. TCP_QUICKACK option is set incorrectly. The goal was force TCP to > send and ACK as a "one time" event. Instead the code permanently sets > connection in the QUICKACK mode. He is right, we actually want to use an even val with TCP_QUICKACK. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/drbd/drbd_int.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index c194348a46ed..6d79a76ba597 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1540,7 +1540,7 @@ static inline void drbd_tcp_nodelay(struct socket *sock)
static inline void drbd_tcp_quickack(struct socket *sock)
{
- int __user val = 1;
+ int __user val = 2;
(void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK,
(char __user *)&val, sizeof(val));
}