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Re: [qemu-s390x] [PATCH for-2.13] pc-bios/s390-ccw: Increase virtio time

From: Thomas Huth
Subject: Re: [qemu-s390x] [PATCH for-2.13] pc-bios/s390-ccw: Increase virtio timeout to 30 seconds
Date: Thu, 29 Mar 2018 13:32:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 29.03.2018 12:03, Christian Borntraeger wrote:
> On 03/29/2018 11:37 AM, Thomas Huth wrote:
>> The current timeout is set to only three seconds - and considering that
>> vring_wait_reply() or rather get_second() is not doing any rounding,
>> the real timeout is likely rather 2 seconds in most cases. When the
>> host is really badly loaded and we run the guest in TCG mode instead
>> of KVM, it's possible that we hit this timeout by mistake. So let's
>> increase the timeout to 30 seconds instead to ease this situation (30
>> seconds is also the timeout that is used by the Linux SCSI subsystem
>> for example, so this seems to be a sane value for block IO timeout).
> I have never seen this, but cant this also with KVM (e.g. host paging
> and the swap disk is busy for some seconds).

Sure, I even assume that Lukáš might have hit this with KVM, and not
with TCG. It's just a little bit more unlikely there.

> Wouldnt it also qualify for 2.12?

Yes, I was just not sure whether we want to rebuild the s390-ccw.img
just because of this ... I'd like to leave that decision to you and


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