[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCHv1 net] xen-netback: support frontends without feature-rx-notify again
On 18/12/14 17:50, David Miller wrote: > From: David Vrabel <david.vrabel@xxxxxxxxxx> > Date: Thu, 18 Dec 2014 11:13:06 +0000 > >> Commit bc96f648df1bbc2729abbb84513cf4f64273a1f1 (xen-netback: make >> feature-rx-notify mandatory) incorrectly assumed that there were no >> frontends in use that did not support this feature. But the frontend >> driver in MiniOS does not and since this is used by (qemu) stubdoms, >> these stopped working. >> >> Netback sort of works as-is in this mode except: >> >> - If there are no Rx requests and the internal Rx queue fills, only >> the drain timeout will wake the thread. The default drain timeout >> of 10 s would give unacceptable pauses. >> >> - If an Rx stall was detected and the internal Rx queue is drained, >> then the Rx thread would never wake. >> >> Handle these two cases (when feature-rx-notify is disabled) by: >> >> - Reducing the drain timeout to 30 ms. >> >> - Disabling Rx stall detection. >> >> Reported-by: John <jw@xxxxxxxxxxxxxxxxxx> >> Tested-by: John <jw@xxxxxxxxxxxxxxxxxx> >> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> > > Applied, and I assume that 3.18 -stable needs this as well? Yes, please. Without it, netback just doesn't work with an important use case. Thanks. David _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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