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On Fri, 2005-10-07 at 09:41 +0200, Jens Axboe wrote: > Ok that makes more sense! But it's a little worrying that > blk_queue_end_tag() would show up as hot in the profile, it is actually > quite lean. it probably just is the first one to touch the IO structures after the completion, and thus gets the penalty for the cachemiss. Something has to have that after io completion (the io started usually > 10 msec ago after all, and usually on another cpu at that) and my experience is that it's one of those jello elephants; you can only move it around but not really avoid it. - 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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