Date: Tue, 28 Apr 2009 11:45:07 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: Improving geom_mirror(4)'s read balancing Message-ID: <gt6j7e$r6n$1@ger.gmane.org> In-Reply-To: <49F6CA67.6030302@FreeBSD.org> References: <49F6CA67.6030302@FreeBSD.org>
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[-- Attachment #1 --] Maxim Sobolev wrote: > The patch is available here: > http://sobomax.sippysoft.com/~sobomax/geom_mirror.diff. I would like to > get input on the functionality/code itself, as well on what is the best > way to add this functionality. Right now, it's part of the round-robin > balancing code. Technically, it could be added as a separate new > balancing method, but for the reasons outlined above I really doubt > having "pure" round-robin has any practical value now. The only case > where previous behavior might be beneficial is with solid-state/RAM > disks where there is virtually no seek time, so that by reading close > sectors from two separate disks one could actually get a better speed. > At the very least, the new method should become default, while "old > round-robin" be another option with clearly documented shortcomings. I > would really like to hear what people think about that. Have you perhaps seen this: http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/113885 I'm using the patch in the PR and it helps a bit, similar to what you have seen. Pawel is silent about the issue so I guess it can also be taken as silent approval :) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkn20C0ACgkQldnAQVacBcjtbgCfR6K908CAxNkroh7pHyeW0Y/e 6BYAn3g0rjctYlI/qJ7VvwKoyU+dMd73 =H8j2 -----END PGP SIGNATURE-----help
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