lkml.org 
[lkml]   [2023]   [Jun]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 1/1] gro: decrease size of CB
> On 01/06/2023 19:14, Richard Gobert wrote:
> > The GRO control block (NAPI_GRO_CB) is currently at its maximum size.
> > This commit reduces its size by putting two groups of fields that are
> > used only at different times into a union.
> >
> > Specifically, the fields frag0 and frag0_len are the fields that make up
> > the frag0 optimisation mechanism, which is used during the initial
> > parsing of the SKB.
> >
> > The fields last and age are used after the initial parsing, while the
> > SKB is stored in the GRO list, waiting for other packets to arrive.
> >
> > There was one location in dev_gro_receive that modified the frag0 fields
> > after setting last and age. I changed this accordingly without altering
> > the code behaviour.
> >
> > Signed-off-by: Richard Gobert <richardbgobert@gmail.com>
>
> Hello Richard,
>
> I believe this commit broke gro over udp tunnels.
> I'm running iperf tcp traffic over geneve interfaces and the bandwidth
> is pretty much zero.
>
> Turning off gro on the receiving side (or reverting this commit)
> resolves the issue.

Sorry for the late response.
I am starting to look into it right now. Can you please share more details about your setup?
- I'd like to see the output of these commands:
ethtool -k
sysctl net
- The iperf command
- Your network topology

\
 
 \ /
  Last update: 2023-06-29 14:38    [W:0.089 / U:2.328 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site