netdev - Re: all syscalls initially taking 4usec on a P4? Re: nonblocking UDPv4 recvfrom() taking 4usec @ 3GHz?

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Date:	Tue, 20 Feb 2007 20:18:10 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	bert hubert <bert.hubert@...herlabs.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: all syscalls initially taking 4usec on a P4? Re: nonblocking UDPv4 recvfrom() taking 4usec @ 3GHz?

On Tue, Feb 20, 2007 at 08:11:20PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> I would try it today - but it is a bit late in Moscow already - and
> there are some things to complete yet. So, tomorrow I will create a patch
> and run it, but I seriously doubt that there is _that_ high per-recvfrom 
> latency.

As of now - syscall which just copies 50 bytes from /dev/zero eats about
400-450 nanosecods per run (core duo 3.7 ghz).

-- 
	Evgeniy Polyakov
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