Re: Poor disk performance in NetBSD DomU, again

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, May 13, 2014 at 01:29:23PM -0400, Yi Qiao wrote:
> Hi Manuel
> 
>   Sorry about that. It's all PV guests. And I don't think partition
> alignments is the dominating issue here since after each experiment, I

it can, depending on how the virtual disk is partitionned in the guest.

> remove the lvm volume for that guest, and create a new one for the
> next guest.
> 
>   I also did some more experiment with HVM guests, and here are the
> results (all with NetBSD Dom0)
> 
>   NetBSD: 61.66 MB/s (write); 73.69 MB/s (read)
>   FreeBSD-9.2: 98.61 MB/s (write); 103.81 MB/s (read)
>   OpenBSD-5.5: 24.91 MB/s (write); 59.96 MB/s (read)
>   Ubuntu 14.04: 129 MB/s (write); 131 MB/s (read)
> 
> It's interesting to see that NetBSD HVM DomU actually out-performed PV
> DomU,

that's strange indeed

> but still lagging behind FreeBSD and Ubuntu.

that's not surprising, as NetBSD HVM guests lacks PV drivers.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--