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Date: Wed, 16 Dec 2020 15:59:54 -0800 From: Ben Greear <greearb@...delatech.com> To: netdev <netdev@...r.kernel.org>, edumazet@...gle.com Subject: Re: net: tso: add UDP segmentation support: adds regression for ax200 upload On 12/16/20 3:09 PM, Ben Greear wrote: > Hello Eric, > > The patch below evidently causes TCP throughput to be about 50Mbps instead of 700Mbps > when using ax200 to upload tcp traffic. > > When I disable TSO, performance goes back up to around 700Mbps. As a followup, when I revert the patch, upload speed goes to ~900Mbps, so even better than just disabling TSO (I left TSO enabled after reverting the patch). Thanks, Ben > > I recall ~5 years ago we had similar TCP related performance issues with ath10k. > I vaguely recall that there might be some driver-level socket pacing tuning value, but I cannot > find the right thing to search for. Is this really a thing? If so, maybe it will > be a way to resolve this issue? > > See this more thorough bug report: > > https://bugzilla.kernel.org/show_bug.cgi?id=209913 > > Patch description: > net: tso: add UDP segmentation support > Note that like TCP, we do not support additional encapsulations, > and that checksums must be offloaded to the NIC. > > Signed-off-by: Eric Dumazet <edumazet@...gle.com> > Signed-off-by: David S. Miller <davem@...emloft.net> > > Thanks, > Ben >
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