netdev - Re: [PATCH 0/1] RFC: poll/select performance on datagram sockets

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Message-ID: <1288385116.2680.11.camel@edumazet-laptop>
Date:	Fri, 29 Oct 2010 22:45:16 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	jj@...osbits.net, alban.crequy@...labora.co.uk,
	shemminger@...tta.com, gorcunov@...nvz.org, adobriyan@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	pauli.nieminen@...labora.co.uk, rweikusat@...gmbh.com
Subject: Re: [PATCH 0/1] RFC: poll/select performance on datagram sockets

Le vendredi 29 octobre 2010 à 13:40 -0700, David Miller a écrit :
> From: Jesper Juhl <jj@...osbits.net>
> Date: Fri, 29 Oct 2010 22:20:12 +0200 (CEST)
> 
> > Sorry to intrude out of the blue without really understanding the kernel 
> > side of most of the code in question, but if there's a performance 
> > regression for applications using poll() shouldn't we address that so we 
> > get back to the prior performance level rather than requireing all 
> > userspace apps to switch to epoll() ??
> 
> For such a pathological program like Alban's test case, I say
> absolutely not.

Yes, and with some perf tool help, we probably can find out how to
speedup the thing again, with no API change.



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