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Date: Sat, 17 Jan 2009 17:50:59 +0100 From: "Leon Woestenberg" <leon.woestenberg@...il.com> To: "Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca> Cc: "Jens Axboe" <axboe@...nel.dk>, "Andrea Arcangeli" <andrea@...e.de>, akpm@...ux-foundation.org, "Ingo Molnar" <mingo@...e.hu>, "Linus Torvalds" <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, ltt-dev@...ts.casi.polymtl.ca, "Thomas Gleixner" <tglx@...utronix.de> Subject: Re: [RFC PATCH] block: Fix bio merge induced high I/O latency Hello Mathieu et al, On Sat, Jan 17, 2009 at 5:26 PM, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote: > A long standing I/O regression (since 2.6.18, still there today) has hit > Slashdot recently : > http://bugzilla.kernel.org/show_bug.cgi?id=12309 Are you sure you are solving the *actual* problem? The bugzilla entry shows a bisect attempt that leads to a patch involving negative clock jumps. http://bugzilla.kernel.org/show_bug.cgi?id=12309#c29 with a corrected link to the bisect patch: http://bugzilla.kernel.org/show_bug.cgi?id=12309#c30 Wouldn't a negative clock jump be very influential to the (time-driven) I/O schedulers and be a more probable cause? Regards, -- Leon p.s. Added Thomas to the CC list as his name is on the patch Signed-off-by list. -- 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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