netdev - Re: [PATCH net-next] epoll: add EPOLLEXCLUSIVE support

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Message-ID: <1329253575.2555.16.camel@edumazet-laptop>
Date:	Tue, 14 Feb 2012 22:06:15 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Davide Libenzi <davidel@...ilserver.org>
Subject: Re: [PATCH net-next] epoll: add EPOLLEXCLUSIVE support

Le mardi 14 février 2012 à 21:48 +0100, Hagen Paul Pfeifer a écrit :
> High performance server sometimes create one listening socket (e.g. port
> 80), create a epoll file descriptor and add the socket. Afterwards
> create SC_NPROCESSORS_ONLN threads and wait for events. This often
> result in a thundering herd problem because all CPUs are scheduled.
> 
> This patch add an additional flag to epoll_ctl(2) called EPOLLEXCLUSIVE.
> If a descriptor is added with this flag only one CPU is scheduled in.
> 
> Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
> Reported-by: Li Yu <raise.sail@...il.com>
> Cc: Davide Libenzi <davidel@...ilserver.org>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> ---

Seems pretty good to me.

Do you have some performance numbers to share ?




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