*BSD News Article 88832


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From: Lars Hofhansl <lhofhans@indiana.edu>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: FreeBSD does interleaved paging : faster?
Date: Mon, 03 Feb 1997 22:25:42 -0600
Organization: Indiana University
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Junichi Kurokawa wrote:
> 
> The subject says it all....
> 
> With dedicated hardwares e.g. Suns, I occasionally hear that interleaved
> swap partitions improve paging performance.
> 
> But how about the case with a ubiquitous PC MB plus *signle channel*
> SCSI a la AHA2940, and FreeBSD?  Is it faster?
> 
> Your comments are welcomed, thanks!
> 
> Regards,
> junichi

It's definately faster if you use seperate _disks_ (assuming all
the disk are about the same speed).

On an older system I had swap and /usr on different disk, which
gave quite a preformance gain.

Having serveral swappartitions of different disks should give
some performance gain also, since it (in the best case) halfs the
seektime (since the seeks can be done in parallel) as seen by the
operating system (the "page latency" of course is unchanged, and the
throughput may and may not by changed).

	Lars