netdev - Re: [PATCH net-next v2 6/9] selftests: drv-net: gro: use SO

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Message-ID: <willemdebruijn.kernel.743811e01cc@gmail.com>
Date: Sun, 08 Feb 2026 21:39:38 -0500
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, 
 davem@...emloft.net
Cc: netdev@...r.kernel.org, 
 edumazet@...gle.com, 
 pabeni@...hat.com, 
 andrew+netdev@...n.ch, 
 horms@...nel.org, 
 shuah@...nel.org, 
 willemb@...gle.com, 
 petrm@...dia.com, 
 donald.hunter@...il.com, 
 michael.chan@...adcom.com, 
 pavan.chebbi@...adcom.com, 
 linux-kselftest@...r.kernel.org, 
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next v2 6/9] selftests: drv-net: gro: use SO_TXTIME to
 schedule packets together

Jakub Kicinski wrote:
> Longer packet sequence tests are quite flaky when the test is run
> over a real network. Try to avoid at least the jitter on the sender
> side by scheduling all the packets to be sent at once using SO_TXTIME.
> Use hardcoded tx time of 5msec in the future. In my test increasing
> this time past 2msec makes no difference so 5msec is plenty of margin.
> Since we now expect more output buffering make sure to raise SNDBUF.
> 
> Experimenting with long sequences I see frequent failures when sending
> 200 packets, only 50-100 packets get coalesced. With this change
> up to 1000 packets get coalesced relatively reliably.
> 
> Reviewed-by: Petr Machata <petrm@...dia.com>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Does this require having FQ installed? I don't see any qdisc config
in the GRO test.