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On Fri, 18 Aug 2006 09:03:15 +0200 Jens Axboe <axboe@suse.de> wrote: > On Thu, Aug 17 2006, Andrew Morton wrote: > > It seems that the many-writers-to-different-disks workloads don't happen > > very often. We know this because > > > > a) The 2.4 performance is utterly awful, and I never saw anybody > > complain and > > Talk to some of the people that used DVD-RAM devices (or other > excruciatingly slow writers) on their system, and they would disagree > violently :-) umm, OK, I guess that has the same cause: buffer_heads from different devices all on the same single queue. In this case the problem is that one device is slow. In the same-speed-devices case the problem is that all writeback threads get stuck on the same device, allowing others to go idle. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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