netdev - Re: [patch 1/4] - Potential performance bottleneck for Linxu TCP

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Message-Id: <20061130.121443.116355312.davem@davemloft.net>
Date:	Thu, 30 Nov 2006 12:14:43 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	johnpol@....mipt.ru
Cc:	nickpiggin@...oo.com.au, mingo@...e.hu, wenji@...l.gov,
	akpm@...l.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] - Potential performance bottleneck for Linxu TCP

From: Evgeniy Polyakov <johnpol@....mipt.ru>
Date: Thu, 30 Nov 2006 13:22:06 +0300

> It steals timeslices from other processes to complete tcp_recvmsg()
> task, and only when it does it for too long, it will be preempted.
> Processing backlog queue on behalf of need_resched() will break
> fairness too - processing itself can take a lot of time, so process
> can be scheduled away in that part too.

Yes, at this point I agree with this analysis.

Currently I am therefore advocating some way to allow
full input packet handling even amidst tcp_recvmsg()
processing.
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