>>> On 21.04.15 at 12:11, <david.vra...@citrix.com> wrote: > We have analysed the affect of this series on interrupt latency (by > measuring the duration of irq disable/enable regions) and there is no > signficant impact. > > http://xenbits.xen.org/people/dvrabel/bar2_comp.png
Thanks for doing this! > Interestingly, the biggest offenders for long critical sections are > bare irq disable/enable regions, and some of these are really bad (10s > of ms)! > > http://xenbits.xen.org/people/dvrabel/bar_normal_busy.png Despite both pictures saying micro-seconds at the respective axis (and hence the problem not being _as bad_) - did the data collection reveal where these IRQ disable regions are, so we could look into eliminating them? (ISTR there being some open coded IRQ-disable, lock, unlock, IRQ-restore/enable sequences, but I'm not sure whether they got eliminated already.) Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
