Re: disappointing speed with virtio_blk

[Gerd von Egidy <lists@egidy.de>]

Hi Marcelo,

> virtio-blk is doing synchronous IO which blocks the guest CPU.
>
> This is especially bad for write intensive loads where the guest
> will hang in the host write throttling logic.
>
> In the meantime please try the following patch:
>
> http://www.mail-archive.com/kvm-devel@lists.sourceforge.net/msg14732.html

Thank you for this hint.

I tried it this evening with kvm 66 - which should include your patch, right?

The result, at least with bonnie++, is nearly the same.

I looked at the patch for the guest kernel you sent with this patch but 
looking at the discussion it did not work.

Kind regards,

Gerd

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