headsup: swap_pager.c

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Aug 1 00:06:22 PDT 2003

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.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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