Re: [Xen-devel] VT is comically slow

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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


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