Re: strange guest slowness after some time

[Tomasz Chmielewski <mangoo@wpkg.org>]

Rusty Russell wrote:
> On Tuesday 07 April 2009 00:49:17 Tomasz Chmielewski wrote:
>> Tomasz Chmielewski schrieb:
>>
>>> As I mentioned, it was using virtio net.
>>>
>>> Guests running with e1000 (and virtio_blk) don't have this problem.
>> Also, virtio_console seem to be affected by this "slowness" issue.
> 
> I'm pretty sure this is different.  Older virtio_console code ignored
> interrupts and polled, and use a heuristic to back off on polling (this was
> because we used the generic "hvc" infrastructure which hacked support).
> 
> You'll find a delay on the first keystroke after idle, but none on the
> second.

I still observe this "slowness" with kvm-86 after the guest is running 
for some time (virtio_net and virtio_console seem to be affected; guest 
restart doesn't fix it).

-- 
Tomasz Chmielewski
http://wpkg.org