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RE: [Xen-devel][Pv-ops][PATCH] Netback multiple tasklet support

To: "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel][Pv-ops][PATCH] Netback multiple tasklet support
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Date: Fri, 27 Nov 2009 16:15:48 +0000
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Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
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Thread-index: AcpvCRTacBm7g/TlQ5GetSSm6xA1EAAc2xzg
Thread-topic: [Xen-devel][Pv-ops][PATCH] Netback multiple tasklet support
> Test Case     Packet Size     Throughput(Mbps)        Dom0 CPU Util   Guests 
> Util
> w/o patch     1400            4304.30         400.33%         112.21%
> w/   patch    1400            9533.13         461.64%         243.81%
> BTW, when we test this patch, we found that the domain_lock in grant table
> operation becomes a bottle neck. We temporarily remove the global
> domain_lock to achieve good performance.

What are the figures with the domain_lock still present? How many VCPUs did 
dom0 have (it would be good to see numbers for 2,3 and 4 VCPUs). 

I'd rather see use of kthreads than tasklets as this enables more control over 
QoS (I believe there are patches for this).


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