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SubjectRe: 2.6.9 RCU breakage in dev_queue_xmit
Herbert Xu wrote:

>Jeff V. Merkey <> wrote:
>>Running dual gigabit interfaces at 196 MB/S (megabytes/second) on
>>receive, 12 CLK interacket gap time, 1500 bytes payload
>>at 65000 packets per second per gigabit interface, and retransmitting
>>received packets at 130 MB/S out of a third gigabit interface
>>with skb, RCU locks in dev_queue_xmit breaks and enters the following state:
>This patch might help.


Even with this patch I still see RCU breakage at these data rates and
the problem persists -- it just takes
longer for it to manifest (about 23 hours). I am recoding
dev_queue_xmit since the use of RCU primitives
is severely busted. I looked over the code and the fact it breaks on
uniprocessor is really a joke.
No offense guys, but this is pretty bad. How about something simple,
like a spinlock or
multiple send queues per proc?


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