Comment 3 for bug 1984103
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| bugproxy (bugproxy) wrote Comment bridged from LTC Bugzilla | #3 |
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0e1f616
(Get the code!)
------- Comment From <email address hidden> 2022-08-10 04:10 EDT-------
clarification from development on the overall situation:
Symptoms:
A) Since
02d5cb5bb20b ("qeth: Accurate ethtool output")
query_card_info is called for each qeth_get_
Frequent calls to ethtool?s get_link_ksetting can put pressure on the zVM VSwitch
that lead to timeouts in the qeth driver that responds with recovering the affected interface.
B) Since
e6e771b3d897 ("s390/qeth: detach netdevice while card is offline")
there is a window condition that query_card_info can interfere with recovery and
lead to failing recovery.
7a07a29e4f67 ("s390/qeth: cache link_info for ethtool") solves both problems.
Backport considerations:
A) 02d5cb5bb20b ("qeth: Accurate ethtool output")
went into kernel v3.14 and was backported to RHEL7.9
B) e6e771b3d897 ("s390/qeth: detach netdevice while card is offline")
went into kernel v5.1 and was backported to RHEL8.2