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Open Source and information security mailing list archives
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Date: Thu, 26 Mar 2009 17:11:48 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Theodore Tso <tytso@....edu>, David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Linux 2.6.29 On Wed, 25 Mar 2009 16:23:08 -0700 (PDT) Linus Torvalds <torvalds@...ux-foundation.org> wrote: > > > On Wed, 25 Mar 2009, Theodore Tso wrote: > > > > > > The problem being that unlike the ratio, there's no sane default value > > > that you can at least argue is not _entirely_ pointless. > > > > Well, if the maximum time that someone wants to wait for an fsync() to > > return is one second, and the RAID array can write 100MB/sec > > How are you going to tell the kernel that the RAID array can write > 100MB/s? > > The kernel has no idea. > userspace can do it quite easily. Run a self-tuning script after installation and when the disk hardware changes significantly. It is very disappointing that nobody appears to have attempted to do _any_ sensible tuning of these controls in all this time - we just keep thrashing around trying to pick better magic numbers in the base kernel. Maybe we should set the tunables to 99.9% to make it suck enough to motivate someone. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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