[Xen-devel] Re: [Xen-changelog] [xen-unstable] [PV-ON-HVM] Don't generate lots ofspurious interrupts when using event

[Steven Smith <sos22-xen@xxxxxxxxxxxxx>]

>       This does solve the problem, however it adds unnecessary overhead 
> (one more trap into xen at the end of each event handler). IMO, the real 
> cause should be in pic_intack, where pending irr is converted into isr.
I'm inclined to agree here.  The patch I checked in certainly wasn't
very pretty, and this is the best alternative I've heard so far.
However, it looks like it's actually slower than what we've got at the
moment: NPtcp between dom0 and domU on my test box reports a latency
and maximum bandwidth of 36.42us and 1961.58Mbps without this patch, or
45.94us and 1874.69Mbps with.  All measurements are best-of-three.

Looking at the patch, it ought to have been slightly faster, so these
results rather surprised me.  Did you do any benchmarks yourself?

Steven.

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