On Wed, May 06, 2020 at 04:37:41PM +0800, Jason Wang wrote:
>
> On 2020/5/6 下午4:08, Michael S. Tsirkin wrote:
> > So for mergeable bufs, we use ewma machinery to guess the correct buffer
> > size. If we don't guess correctly, XDP has to do aggressive copies.
> >
> > Problem is, xdp paths do not u
On Wed, May 06, 2020 at 10:37:57AM +0200, Jesper Dangaard Brouer wrote:
> On Wed, 6 May 2020 04:08:27 -0400
> "Michael S. Tsirkin" wrote:
>
> > So for mergeable bufs, we use ewma machinery to guess the correct buffer
> > size. If we don't guess correctly, XDP has to do aggressive copies.
> >
> >
On Wed, 6 May 2020 04:08:27 -0400
"Michael S. Tsirkin" wrote:
> So for mergeable bufs, we use ewma machinery to guess the correct buffer
> size. If we don't guess correctly, XDP has to do aggressive copies.
>
> Problem is, xdp paths do not update the ewma at all, except
> sometimes with XDP_PASS
On 2020/5/6 下午4:08, Michael S. Tsirkin wrote:
So for mergeable bufs, we use ewma machinery to guess the correct buffer
size. If we don't guess correctly, XDP has to do aggressive copies.
Problem is, xdp paths do not update the ewma at all, except
sometimes with XDP_PASS. So whatever we happen
So for mergeable bufs, we use ewma machinery to guess the correct buffer
size. If we don't guess correctly, XDP has to do aggressive copies.
Problem is, xdp paths do not update the ewma at all, except
sometimes with XDP_PASS. So whatever we happen to have
before we attach XDP, will mostly stay aro
