Date: Thu, 28 Dec 2006 19:27:50 +0100 From: Ivan Voras <ivoras@fer.hr> To: freebsd-geom@freebsd.org Subject: Re: gstripe performance scaling with many disks Message-ID: <en12b6$l2e$2@sea.gmane.org> In-Reply-To: <en125k$l2e$1@sea.gmane.org> References: <20061228171858.GA11296@qlovarnika.bg.datamax> <en125k$l2e$1@sea.gmane.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigC0CDD9C5C2B97BF14E2645A8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Ivan Voras wrote: > I'll take a shot at this: Since maximum kernel reads are still limited > to 128 KB/s, by adding more drives you're making individual requests > shorter. I.e. with one drive, it gets 128 KB requests, with two, each > gets 64 KB, with 16, each gets 8 KB. So network & kernel latency become= s > visible. Btw. if I'm right, you should be able to observe this with gstat and/or iostat. If you don't see it, then it's possible I'm wrong :) --------------enigC0CDD9C5C2B97BF14E2645A8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFlAymldnAQVacBcgRAht9AKCo4K2oMISgKKOTQeUeQpNToEhhRwCglpAc hQpiTQrnYBwjCOXyG8l/oyA= =UuL+ -----END PGP SIGNATURE----- --------------enigC0CDD9C5C2B97BF14E2645A8--
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