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Cisco Bug: CSCvi25922 - on cisco VIC driver versions 2.3.0.32 or higher TCP/NFS hangs are seen/found

Last Modified

Aug 13, 2019

Products (1)

  • Cisco UCS Virtual Interface Card

Known Affected Releases

2.2(7b)C 2.2(7c)A 2.2(7c)B 2.2(7c)C 2.2(7d)C 2.2(7e)C 2.2(8a)C 2.2(8b)C 2.2(8c)A 2.2(8c)B 2.2(8c)C 2.2(8f)C 2.2(8g)C 3.1(1e)C 3.1(1g)C 3.1(1h)C 3.1(1k)C 3.1(1l)C 3.1(2b)C 3.1(2c)A 3.1(2c)B 3.1(2c)C 3.1(2e)C 3.1(2f)C 3.1(2g)C 3.1(2h)C 3.1(3a)C 3.1(3b)C 3.1(3c)A 3.1(3c)B 3.1(3c)C 3.2(1d)C

Description (partial)

Symptom:
On the SLES 12 server the settings for SACK and/or TCP_TIMESTAMPS have been disabled, or on the other end of the TCP conversation those settings are disabled.

Conditions:
under heavy tcp traffic load  customers using  NFS as a filesystem mount from time to time will run into nfs hangs/ TCP hang from the os.
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