Re: [Xen-devel] I/O descriptor ring size bottleneck?

[Diwaker Gupta <diwakergupta@xxxxxxxxx>]

> BTW, I'd actually be very suspicious of dummynet's ability to operate at
> 500Mb/s. It's possible that the reduced bandwidth is due to some bad
> interaction between burstiness caused by Xen's context switching and
> dummynet.

Could you elaborate a bit more on this? Even if dummynet can't operate
at 500Mbps, we should atleast see the same degradation in performance
right?

> Are your dom0 and domU running on the same processor? Could you try
> using hyperthreading or SMP?

Yep, same processor. For various other reasons, I wanted to avoid SMP,
so I was running with the nosmp option. I'll try running with SMP and
post an update.

> Have you checked that domU <-> domU performance is good on the LAN with
> a single TCP connection?

I had a long time back, but I think that was with SMP. I'll check again. 
-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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