Re: [qemu-s390x] [PATCH for-2.13] pc-bios/s390-ccw: Increase virtio timeout to 30 seconds

[Cornelia Huck]

On Thu, 29 Mar 2018 11:37:31 +0200
Thomas Huth <address@hidden> 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. 

Let's tweak this sentence to

"When the host is really badly loaded, it's possible that we hit this
timeout by mistake; it's even more likely if we run the guest in TCG
mode instead of KVM."

?

> 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).
> 
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1549079
> Signed-off-by: Thomas Huth <address@hidden>
> ---
>  pc-bios/s390-ccw/virtio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)