Gerd Hoffmann wrote:
Well, I see a massive slowdown when switching from sync to aio in the xen backend code. I think the reason is that due to the lack of a vectored interface (and thus /me submitting separate aio requests for each iovec element) stuff gets parallelized *way* too much and disk seek times are killing me.
Try switching to the deadline io scheduler. cfq has a known issue with this.
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