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Open Source and information security mailing list archives
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Date: Sat, 2 Apr 2022 09:32:24 -0700 From: Eric Dumazet <edumazet@...gle.com> To: Neal Cardwell <ncardwell@...gle.com> Cc: Jaco Kroon <jaco@....co.za>, Florian Westphal <fw@...len.de>, LKML <linux-kernel@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>, Wei Wang <weiwan@...gle.com> Subject: Re: linux 5.17.1 disregarding ACK values resulting in stalled TCP connections On Sat, Apr 2, 2022 at 9:29 AM Neal Cardwell <ncardwell@...gle.com> wrote: > > FWIW those log entries indicate netfilter on the mail client machine > dropping consecutive outbound skbs with 2*MSS of payload. So that > explains the large consecutive losses of client data packets to the > e-mail server. That seems to confirm my earlier hunch that those drops > of consecutive client data packets "do not look like normal congestive > packet loss". This also explains why we have all these tiny 2-MSS packets in the pcap. Under normal conditions, autocorking should kick in, allowing TCP to build bigger TSO packets.
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