[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] large packet support in netfront driver and guest network throughput
On Thu, Sep 19, 2013 at 04:59:49PM +0000, Anirban Chakraborty wrote: [...] > >> > >> I was able to see a bit of improvement (from 2.65 to 3.6 Gbps) with the > >> following patch (your patch plus the advertisement of NETIF_F_GRO) : > > > > OK, thanks for reporting back. > > > > I'm curious about the packet size after enabling GRO. I can get 5G/s > > upstream with packet size ~24K on a 10G nic. It's not line rate yet, > > certainly there is space for improvement. > > I am seeing varying packet sizes with the GRO patch, from 2K to all the way > upto 64K. > I do not think we can get line rate by enabling GRO only. The netback thread > that is handling the guest traffic is running on a different CPU (and > possibly different node) compared to the guest. If we can schedule netback > for a guest to run on the same node as the guest, we should be able to see > better numbers. You can use vcpu pin to pin Dom0's CPUs and Dom0's CPUs to the same NUMA node. However domain's memory might still be striped across different nodes. > In any case, are you going to submit the patch upstream or should I do it? I will do that once net-next is open. Wei. > Thanks. > > Anirban > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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