linux-kernel - Re: Cache line size

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Message-ID: <200609110842_MC3-1-CAD5-5E83@compuserve.com>
Date:	Mon, 11 Sep 2006 08:41:03 -0400
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Dave Jones <davej@...hat.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	John Richard Moser <nigelenki@...cast.net>
Subject: Re: Cache line size

In-Reply-To: <20060911053144.GB18727@...hat.com>

On Mon, 11 Sep 2006 01:31:44 -0400, Dave Jones wrote:

> > > Is there a way for the Linux Kernel to know the cache line size of the
> > > CPU it's on, besides #define X86_CACHE_LINE_SZ 32 or whatnot?
> > 
> > /sys/devices/system/cpu/cpu<N>/cache
>
> Hmm..
>
> $ find /sys/ -name cache
> $
>
> That's on 2.6.18rc6.  Is this some -mm only feature?

Looks like it's only there on Intel CPUs with CPUID level >= 0x00000004
and AMD CPUs with extended CPUID level >= 0x80000006, like this one:

vendor_id       : AuthenticAMD
cpu family      : 15
model           : 72

It's not there on:

vendor_id       : GenuineIntel
cpu family      : 6
model           : 6

Oh well...  

-- 
Chuck

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