linux-kernel - Re: [RFC 1/4] kevent: core files.

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Message-ID: <20060731105943.GA26114@gondor.apana.org.au>
Date:	Mon, 31 Jul 2006 20:59:43 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	johnpol@....mipt.ru, drepper@...hat.com, zach.brown@...cle.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC 1/4] kevent: core files.

On Mon, Jul 31, 2006 at 03:57:16AM -0700, David Miller wrote:
> 
> So I would say for up to 4 or 5 events, system call overhead alone
> touches as many cache lines as the events themselves.

Absolutely.

The other to consider is that events don't come from the hardware.
Events are written by the kernel.  So if user-space is just reading
the events that we've written, then there are no cache misses at all.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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