Author: erj
Date: Fri Jun 26 17:13:23 2015
New Revision: 284876
URL: https://svnweb.freebsd.org/changeset/base/284876
Log:
Limit the number of autoconfigured queues to 8.
This limit was in a previous version of the driver, but it is being re-
added to match the behavior of previous versions of 10. It prevents the
driver from using too many MSI-X vectors on systems with a large number of
logical CPU cores.
Thanks to <j...@slowblink.com> for bringing up this issue.
Approved by: jfv (mentor)
Modified:
stable/10/sys/dev/ixgbe/if_ix.c
Modified: stable/10/sys/dev/ixgbe/if_ix.c
==============================================================================
--- stable/10/sys/dev/ixgbe/if_ix.c Fri Jun 26 16:14:00 2015
(r284875)
+++ stable/10/sys/dev/ixgbe/if_ix.c Fri Jun 26 17:13:23 2015
(r284876)
@@ -285,7 +285,8 @@ SYSCTL_INT(_hw_ix, OID_AUTO, enable_msix
*/
static int ixgbe_num_queues = 0;
SYSCTL_INT(_hw_ix, OID_AUTO, num_queues, CTLFLAG_RDTUN, &ixgbe_num_queues, 0,
- "Number of queues to configure, 0 indicates autoconfigure");
+ "Number of queues to configure up to a maximum of 8; "
+ "0 indicates autoconfigure");
/*
** Number of TX descriptors per ring,
@@ -548,7 +549,6 @@ ixgbe_attach(device_t dev)
/* Check PCIE slot type/speed/width */
ixgbe_get_slot_info(hw);
-
/* Set an initial default flow control value */
adapter->fc = ixgbe_fc_full;
@@ -2328,6 +2328,9 @@ ixgbe_setup_msix(struct adapter *adapter
if (ixgbe_num_queues != 0)
queues = ixgbe_num_queues;
+ /* Set max queues to 8 when autoconfiguring */
+ else if ((ixgbe_num_queues == 0) && (queues > 8))
+ queues = 8;
/* reflect correct sysctl value */
ixgbe_num_queues = queues;
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