headsup: swap_pager.c

[Greg 'groggy' Lehey]

On Friday,  1 August 2003 at  9:06:18 +0200, Poul-Henning Kamp wrote:
> In message <Pine.NEB.3.96L.1030731190517.85739A-100000 at fledge.watson.org>, Robe
> rt Watson writes:
>>
>> On Thu, 31 Jul 2003, Poul-Henning Kamp wrote:
>>
>>> I am in the process of changing the on-disk layout policy used by the
>>> swap_pager.
>>
>> Do you anticipate any performance changes as a result of this change?
>
> Anticipate ?  No.
> Be surprised by improvements ? No.
>
> The striping code limits the I/O size for paging activity to a small
> size.  By laying out each disk sequentially in the "swap device" we
> can increase that size to what our I/O system can lift.

I'd expect a significant improvement.  In our environment, throughput
is almost linearly related to request size, so anything to increase
the transfer size should improve the situation.

Greg
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