Hello,
I read the Linux packet xmit function dev_queue_xmit in dev.c. The code
works as follows:
1. enqueue a packet to the dsic queue
2. dequeue a packet
3. try to accquire xmi_lock, if available, then pass the packet to the
driver
otherwise, requeue the packet and let softirq to handle packet
transmitting
My question is:
why not check the lock first? if the lock is available, then do dequeue.
Thus we can
save unnecessary requeue operation.
Any idea about this?
Thanks,
Liang
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