From: Stephen Hemminger <stephen@networkplumber.org>
To: netdev@vger.kernel.org
Subject: Fw: [Bug 213827] New: Stall In TCP/IP
Date: Thu, 22 Jul 2021 15:16:06 -0700 [thread overview]
Message-ID: <20210722151606.4dd189da@hermes.local> (raw)
Begin forwarded message:
Date: Thu, 22 Jul 2021 22:03:50 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.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@networkplumber.org
Reporter: martenst@crankuptheamps.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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