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Date:   Thu, 22 Jul 2021 15:16:06 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 213827] New: Stall In TCP/IP



Begin forwarded message:

Date: Thu, 22 Jul 2021 22:03:50 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 213827] New: Stall In TCP/IP


https://bugzilla.kernel.org/show_bug.cgi?id=213827

            Bug ID: 213827
           Summary: Stall In TCP/IP
           Product: Networking
           Version: 2.5
    Kernel Version: Observed 5.9.2. Confirmed on 5.12 and 5.13
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@...workplumber.org
          Reporter: martenst@...nkuptheamps.com
        Regression: No

Created attachment 298007
  --> https://bugzilla.kernel.org/attachment.cgi?id=298007&action=edit  
A basic repro of the observed issue.

We see an unexpected pause of 3-60 seconds where the test no longer receives
data, recv() is blocking, netstat shows data is sitting in the 7777 server's
send queue and 0 bytes are in the test's receive queue.

Setting net.core.rmem_max seems to be a key factor. For our testing we used
net.core.rmem_max=16777216

See attached README and repro.

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