Stephen Hemminger wrote:
On Tue, 13 Sep 2005 09:10:12 -0700
Ravikiran G Thirumalai <[email protected]> wrote:
The net_device has a refcnt used to keep track of it's uses.
This is used at the time of unregistering the network device
(module unloading ..) (see netdev_wait_allrefs) .
For loopback_dev , this refcnt increment/decrement is causing
unnecessary traffic on the interlink for NUMA system
affecting it's performance. This patch improves tbench numbers by 6% on a
8way x86 Xeon (x445).
Since when is bringing a network device up/down performance critical?
We grab and drop a reference for each poll of a device, roughly.
See dev_hold in _netif_rx_schedule(struct net_device *dev)
in include/netdevice.h, for instance.
Thanks,
Ben
--
Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
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