David Marchand, Jun 14, 2024 at 08:48:
Querying link status may get delayed for an undeterministic (long) time
with mlx5 ports. This is a consequence of the mlx5 driver calling ethtool
kernel API and getting stuck on the kernel RTNL lock while some other
operation is in progress under this lock.
One impact for long link status query is that it is called under the bond
lock taken in write mode periodically in bond_run().
In parallel, datapath threads may block requesting to read bonding related
info (like for example in bond_check_admissibility()).
The LSC interrupt mode is available with many DPDK drivers and is used by
default with testpmd.
It seems safe enough to switch on this feature by default in OVS.
We keep the per interface option to disable this feature in case of an
unforeseen bug.
Signed-off-by: David Marchand <david.march...@redhat.com>
---
Changes since v1:
- (early) fail when interrupt lsc is requested by user but not supported
by the driver,
- otherwise, log a debug message if user did not request interrupt mode,
This looks good to me. Is there a chance that this could be backported
to the 3.1 branch?
Reviewed-by: Robin Jarry <rja...@redhat.com>
Thanks David!
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