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Date: Wed, 24 Oct 2001 21:19:55 -0700 (PDT)
From: Linus Torvalds <torvalds@transmeta.com>
To: Zlatko Calusic <zlatko.calusic@iskon.hr>
cc: Marcelo Tosatti <marcelo@conectiva.com.br>, <linux-mm@kvack.org>,
        lkml <linux-kernel@vger.kernel.org>
Subject: Re: xmm2 - monitor Linux MM active/inactive lists graphically
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On 25 Oct 2001, Zlatko Calusic wrote:
>
> Sure. Output of 'vmstat 1' follows:
>
>  1  0  0      0 254552   5120 183476   0   0    12    24  178   438 2  37  60
>  0  1  0      0 137296   5232 297760   0   0     4  5284  195   440 3  43  54
>  1  0  0      0 126520   5244 308260   0   0     0 10588  215   230 0   3  96
>  0  2  0      0 117488   5252 317064   0   0     0  8796  176   139 1   3  96
>  0  2  0      0 107556   5264 326744   0   0     0  9704  174    78 0   3  97

This does not look like a VM issue at all - at this point you're already
getting only 10MB/s, yet the VM isn't even involved (there's definitely no
VM pressure here).

> Notice how there's planty of RAM. I'm writing sequentially to a file
> on the ext2 filesystem. The disk I'm writing on is a 7200rpm IDE,
> capable of ~ 22 MB/s and I'm still getting only ~ 9 MB/s. Weird!

Are you sure you haven't lost some DMA setting or something?

		Linus

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