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Date: Tue, 04 Mar 2008 00:23:59 +0100 From: Andi Kleen <andi@...stfloor.org> To: Cyrus Massoumi <cyrusm@....net> Cc: Nick Piggin <nickpiggin@...oo.com.au>, Diego Calleja <diegocg@...il.com>, Stephen Cuppett <cuppett@...il.com>, linux-kernel@...r.kernel.org, mingo@...e.hu, a.p.zijlstra@...llo.nl Subject: Re: Performance versus FreeBSD 7.0 Cyrus Massoumi <cyrusm@....net> writes: > > IIRC, going to fine-grained file locking gave them a huge boost in > this particular benchmark (and maybe others). What locking? You mean their equivalent of i_mutex? There are already file systems on Linux that don't use it significantly for write. > As I said on lwn.net Peter Zijlstra posted a patch to break the global > file list lock about a year ago [1], but I don't think it was ever > merged. Here [2] are some numbers for the patchset. The file_list_lock is only for open/close which MySQL is very unlikely to do in its fast path. You're totally on the wrong path here I think. -Andi -- 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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