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Date: Sun, 5 Nov 2000 14:36:43 +0100 (CET)
From: Rik van Riel <riel@conectiva.com.br>
To: Christoph Rohland <cr@sap.com>
cc: Jonathan George <Jonathan.George@trcinc.com>,
        "'matthew@mattshouse.com'" <matthew@mattshouse.com>,
        "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.0-test10 Sluggish After Load
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On 4 Nov 2000, Christoph Rohland wrote:
> Rik van Riel <riel@conectiva.com.br> writes:
> > Indeed, shared memory performance still sucks rocks.
> 
> No, it's not a performance problem. It is a hard lockup problem on
> highmem machines.
> 
> I do see two problems here:
> 1) shm_swap_core does not handle the failure of prepare_higmem_swapout
>    right and basically cannot do so. It gets called zone independant
>    and should probably get called per zone. At least it has to react:

AFAIC try_to_swap_out can handle this situation fine, it
shouldn't be very difficult to get shm_swap to handle it
too...

Unfortunately I don't have a really big memory machine so
I cannot test this stuff :(

> You see: you only have 5+27+27=59 pages under your control...

Ughhhh. Maybe we need some rebalancing there as well.
That's a maximum of 5 pages of executable text mapped
into all processes...

regards,

Rik
--
The Internet is not a network of computers. It is a network
of people. That is its real strength.

http://www.conectiva.com/		http://www.surriel.com/

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