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Re: [Xen-devel] VT is comically slow
| To: | Rik van Riel <riel@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] VT is comically slow |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 3 Jul 2006 09:58:01 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 03 Jul 2006 01:58:21 -0700 |
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On 3 Jul 2006, at 09:48, Rik van Riel wrote: Looking at it a bit more closely, it appears that postgresql doing disk IO from inside a fully virtualized domain totally kills the CPU. It gets so bad that a simple "dmesg" takes 10-20 seconds to start, and after that it spews data maybe 7 or 8 lines every other second. Actually slower than serial console... This is totally unusable :( Might you be emulating PIO? That would certainly suck. The device model is supposed to support (virtual) DMA though. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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