netdev - Re: [net] tcp: Prevent low rmem stalls with SO

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Message-ID: <20201023113131.780be7f6@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Fri, 23 Oct 2020 11:31:31 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arjun Roy <arjunroy.kdev@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, arjunroy@...gle.com,
        edumazet@...gle.com, soheil@...gle.com, ncardwell@...gle.com
Subject: Re: [net] tcp: Prevent low rmem stalls with SO_RCVLOWAT.

On Fri, 23 Oct 2020 10:48:57 -0700 Arjun Roy wrote:
> From: Arjun Roy <arjunroy@...gle.com>
> 
> With SO_RCVLOWAT, under memory pressure,
> it is possible to enter a state where:
> 
> 1. We have not received enough bytes to satisfy SO_RCVLOWAT.
> 2. We have not entered buffer pressure (see tcp_rmem_pressure()).
> 3. But, we do not have enough buffer space to accept more packets.

Doesn't apply cleanly to net:

Applying: tcp: Prevent low rmem stalls with SO_RCVLOWAT.
error: sha1 information is lacking or useless (net/ipv4/tcp.c).
error: could not build fake ancestor
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 tcp: Prevent low rmem stalls with SO_RCVLOWAT.
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".