Re: [Xen-users] Disk starvation between DomU's

[Wiebe Cazemier <wiebe@xxxxxxxxxxxx>]

----- Original Message -----
> From: "Ian Campbell" <Ian.Campbell@xxxxxxxxxx>
> To: "Thanos Makatos" <thanos.makatos@xxxxxxxxxx>
> Cc: "Wiebe Cazemier" <wiebe@xxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxx
> Sent: Tuesday, 11 June, 2013 12:41:39 PM
> Subject: Re: [Xen-users] Disk starvation between DomU's
> 
> ....Or if using blkback the relevant kernel thread.
> 
> Ian.

That's what I ended up doing. After first having a certain Domu "best effort, 
0", I now put it in the real-time class, with prio 3. I can't say I notice any 
'real-time' performance now. It still hangs occasionally.

Additionally, when I do the following on the virtual machine in question:

dd if=/dev/zero of=dummy bs=1M

I hardly see any disk activity on the Dom0 with iostat. I see the blkback 
popping up occasionally with a few kb/s, but I would expect tens of MB's per 
second. The file 'dummy' is several GB's big in a short while, so it does write.

Why don't I see the traffic popping up in iostat on the Dom0?


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