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drbd: improve network latency, TCP_QUICKACK

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On Thu, Apr 29, 2010 at 04:00:50PM -0400, [email protected]
 wrote on [email protected]
 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 <[email protected]>
Signed-off-by: Lars Ellenberg <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Lars Ellenberg 2010-05-25 14:23:57 +02:00 • committed by Jens Axboe
commit 344fa462e3
1 changed files with 1 additions and 1 deletions
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2
drivers/block/drbd/drbd_int.h
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@ -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));
}