On Thu, 2014-12-18 at 11:13 +0000, David Vrabel wrote: > 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 <j...@nuclearfallout.net> > Tested-by: John <j...@nuclearfallout.net> > Signed-off-by: David Vrabel <david.vra...@citrix.com>
FYI I've seen a report[0] that "Windows 2012 R2 domu with GPLPV drivers" also suffered without feature-rx-notify support in the backend. Ian. [0] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=767261#103 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
