Bug 213827 - Stall In TCP/IP
Summary: Stall In TCP/IP
Status: NEW
Alias: None
Product: Networking
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Stephen Hemminger
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-07-22 22:03 UTC by Tom Martens
Modified: 2021-07-22 22:03 UTC (History)
0 users

See Also:
Kernel Version: Observed 5.9.2. Confirmed on 5.12 and 5.13
Subsystem:
Regression: No
Bisected commit-id:

Attachments
A basic repro of the observed issue. (2.59 KB, application/x-gzip)
2021-07-22 22:03 UTC, Tom Martens 		Details
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Description Tom Martens 2021-07-22 22:03:50 UTC 
Created attachment 298007 [details]
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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