netdev - Re: [PATCH net-next] tcp: try to defer / return acked skbs to originating CPU

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Message-ID: <20260129151011.0c0e4f61@kernel.org>
Date: Thu, 29 Jan 2026 15:10:11 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: kuniyu@...gle.com, ncardwell@...gle.com, netdev@...r.kernel.org,
 davem@...emloft.net, pabeni@...hat.com, andrew+netdev@...n.ch,
 horms@...nel.org
Subject: Re: [PATCH net-next] tcp: try to defer / return acked skbs to
 originating CPU

On Thu, 29 Jan 2026 15:04:59 -0800 Jakub Kicinski wrote:
> > > I was mostly concerned about latency spikes, I did some tests here and
> > > this seems fine.    
> > 
> > Looks like selftests run into the zerocopy Tx latency issue.
> > I'll drop this version from patchwork..  
> 
> Delaying zero copy forever is a bit of an annoyance.
> I believe the same thing can happen in net-next with UDP 
> but I haven't tested to confirm.
> 
> I assume the attached patch is out of question since it came up before?
> 
> [0001-net-periodically-flush-the-defer-queues.patch  text/x-patch (9441 bytes)] 

Ugh, too many patches in my /tmp. I attached an old buggy version, 
but you get the point.