Use of contiguous physical memory in ixgbe driver
Alexander V. Chernikov
melifaro at FreeBSD.org
Tue May 6 16:07:25 UTC 2014
(bootstrapping people involved in previous version of this topic, sorry
There were several problem descriptions/discussions on using 9k+ mbufs
with current allocator in:
I'd like to add ixgbe (and i40e with igb) to the list. We're facing the
same problem for a long time.
As far as I can understand,
a) everyone (tm) is aware of current 9/16k allocation problems leading
to sudden network failures.
b) such mbufs sizes are not absolute evil and can be useful on 40/100G
and for TSO cases.
c) however, no one is able to / willing to fix our allocator to
pre-allocate special arena for mbufs >= 4k page size.
d) so most people have written their own local hacks to disable 9k mbufs
and use 4k ones.
e) our list is not full, people with
mellanox/solarflare/broadcom/emulex/etc are still not there (and most if
not all 10g NICs support scatter/gather).
Can we add more generic hack moving default mbuf size decision from NIC
driver to OS and make it tunable for user?
Example path for Intel ones is attached.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 4001 bytes
Desc: not available
More information about the freebsd-net