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Re: [Xen-users] TAP:AIO much slower then file: ?!
| To: | MS <ms@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] TAP:AIO much slower then file: ?! |
| From: | "Javier Guerra" <javier@xxxxxxxxxxx> |
| Date: | Thu, 31 Jul 2008 09:04:18 -0500 |
| Cc: | xen-users@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 31 Jul 2008 07:05:56 -0700 |
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| In-reply-to: | <4891BB6F.6010709@xxxxxxxxxx> |
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On Thu, Jul 31, 2008 at 8:17 AM, MS <ms@xxxxxxxxxx> wrote: > Hi! > > i checked the io performance with bonnie++ on an domU. > With "file:" i get a goot result (nearly the dom0 results): that "440M" is the test size? if so, it sounds too small. it should at least be twice (5-10x is better) the size of cache available. remember, "file:" devices might be cached by the Dom0, "tap:" won't. with small files it's common to see this pattern on most tests, but won't benefit most real world uses. -- Javier _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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