[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] Network Checksum Removal
On Monday 23 May 2005 03:13 pm, Keir Fraser wrote: > On 23 May 2005, at 20:55, Bin Ren wrote: > > I've added the support for ethtools. By turning on and off netfront > > checksum offloading, I'm getting the following throughput numbers, > > using iperf. Each test was run three times. CPU usages are quite > > similar in two cases ('top' output). Looks like checksum computation > > is not a major overhead in domU networking. > > > > dom0/1/2 all have 128M memory. dom0 has e1000 tx checksum offloading > > turned on. > > What happens to CPU usage in dom1 when tx checksumming is disabled? > > Overall though these are the kind of results I would expect. Linux > usually does csumming at the same time as it has to do a copy anyway, > and it ends up being limited by memory/L2-cache bandwidth, not the > extra computation. But the offload extensions haven't cost much to > implement and there are probably cases where it helps a little. > > Maybe I'm being pessimistic though: Can you reproduce the rather more > impressive speedups that you previously saw, Jon? I would if I could. As I don't use BK, I'll have to wait for the nightly build to pull in your latest fix. Thanks, Jon _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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