On Wed, 2016-01-20 at 10:10 -0500, Boris Ostrovsky wrote: > On 01/20/2016 10:02 AM, David Vrabel wrote: > > On 20/01/16 14:52, Ian Campbell wrote: > > > On Wed, 2016-01-20 at 09:40 -0500, Boris Ostrovsky wrote: > > > > On 01/20/2016 07:23 AM, Ian Campbell wrote: > > > > > There have been a few reports recently[0] which relate to a > > > > > failure of > > > > > netfront to allocate sufficient grant refs for all the queues: > > > > > > > > > > [ 0.533589] xen_netfront: can't alloc rx grant refs > > > > > [ 0.533612] net eth0: only created 31 queues > > > > > > > > > > Which can be worked around by increasing the number of grants on > > > > > the > > > > > hypervisor command line or by limiting the number of queues > > > > > permitted > > > > > by > > > > > either back or front using a module param (which was broken but > > > > > is now > > > > > fixed on both sides, but I'm not sure it has been backported > > > > > everywhere > > > > > such that it is a reliable thing to always tell users as a > > > > > workaround). > > > > > > > > > > Is there any plan to do anything about the default/out of the box > > > > > experience? Either limiting the number of queues or making both > > > > > ends > > > > > cope > > > > > more gracefully with failure to create some queues (or both) > > > > > might be > > > > > sufficient? > > > > > > > > > > I think the crash after the above in the first link at [0] is > > > > > fixed? I > > > > > think that was the purpose of ca88ea1247df "xen-netfront: update > > > > > num_queues > > > > > to real created" which was in 4.3. > > > > I think ca88ea1247df is the solution --- it will limit the number > > > > of > > > > queues. > > > That's in 4.4, which the first link at [0] claimed to have tested. I > > > can > > > see this fixing the crash, but does it really fix the "actually works > > > with > > > less queues than it tried to get" issue? > > That's what I thought it does too. I didn't notice that 4.4 was tested > as well, so maybe not.
I've asked the reporter to send logs for the 4.4 case to xen-devel. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
