[lkml]   [2006]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Bug 7596 - Potential performance bottleneck for Linxu TCP
On Wed, 29 Nov 2006 17:22:10 -0600
Wenji Wu <> wrote:

> From: Wenji Wu <>
> Greetings,
> For Linux TCP, when the network applcaiton make system call to move data
> from
> socket's receive buffer to user space by calling tcp_recvmsg(). The socket
> will
> be locked. During the period, all the incoming packet for the TCP socket
> will go
> to the backlog queue without being TCP processed. Since Linux 2.6 can be
> inerrupted mid-task, if the network application expires, and moved to the
> expired array with the socket locked, all the packets within the backlog
> queue
> will not be TCP processed till the network applicaton resume its execution.
> If
> the system is heavily loaded, TCP can easily RTO in the Sender Side.
> Attached is the detailed description of the problem and one possible
> solution.

Thanks. The attachment will be too large for the mailing-list servers so I
uploaded a copy to

From a quick peek it appears that you're getting around 10% improvement in
TCP throughput, best case.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-11-30 00:45    [W:0.043 / U:14.544 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site