Re: network performance degradation in virtio_net in 4.12-rc

2017-05-22 Thread Mikulas Patocka
On Mon, 22 May 2017, Michael S. Tsirkin wrote: > On Mon, May 22, 2017 at 10:25:19AM -0400, Mikulas Patocka wrote: > > Hi > > > > I see severe network performance degradation with the kernels 4.12-rc1 and > > 4.12-rc2 in the network virtio driver. Download rate drops down to about > > 100kB/s.

Re: network performance degradation in virtio_net in 4.12-rc

2017-05-22 Thread Michael S. Tsirkin
On Mon, May 22, 2017 at 10:25:19AM -0400, Mikulas Patocka wrote: > Hi > > I see severe network performance degradation with the kernels 4.12-rc1 and > 4.12-rc2 in the network virtio driver. Download rate drops down to about > 100kB/s. > > I bisected it and it is caused by patch > d85b758f72b05

network performance degradation in virtio_net in 4.12-rc

2017-05-22 Thread Mikulas Patocka
Hi I see severe network performance degradation with the kernels 4.12-rc1 and 4.12-rc2 in the network virtio driver. Download rate drops down to about 100kB/s. I bisected it and it is caused by patch d85b758f72b05a774045545f24d70980e3e9aac4 ("virtio_net: fix support for small rings"). When I