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| /openbmc/linux/drivers/net/ |
| H A D | tun.c | diff 61a5ff15ebdab87887861a6b128b108404e4706d Thu Jun 09 02:27:10 CDT 2011 Amos Kong <akong@redhat.com> tun: do not put self in waitq if doing a nonblock read
Perf shows a relatively high rate (about 8%) race in
spin_lock_irqsave() when doing netperf between external host and
guest. It's mainly becuase the lock contention between the
tun_do_read() and tun_xmit_skb(), so this patch do not put self into
waitqueue to reduce this kind of race. After this patch, it drops to
4%.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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