[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] XEN 4.3.1 network performance issue
Adding back xen-users@ On Sat, Dec 28, 2013 at 07:34:55PM +0200, NiX wrote: [...] > > I ran 'zmap -p 80 -B 10M -o results.txt --interface=eth0' and took a > screenshot of top. > Is it not the '-B' option limits total bandwidth? In that case it is normal to see it can only use up to 10Mb/s? So the snapshot shows that CPU0 is runing at 78% serving software interrupt while 10% idle. Looks like that backend spends too much serving interrupt handler and not actually doing any work. Could you try the following tree: git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git Which has the latest stable netback / netfront code. In that tree: 1. netback NAPI to mitigate intrrupt (backend only) 2. a new feature call split event channel can be used to avoid some interrupt overhead. (you would need to use frontend / backend that support this feature) P.S. don't use this tree in production. ;-) Wei. > 0:05 0% (1d11h left); send: 74425 14.9 Kp/s (14.8 Kp/s avg); recv: 2196 > 492 p/s (436 p/s avg); drops: 0 p/s (0 p/s avg); hits: 2.95 > > 10mbps ~ 15k packets/second > > The server is dual xeon X5450 _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx http://lists.xen.org/xen-users
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