Messages in this thread |  | | Subject | Re: Spinlock debugging | | From | Alan Cox <> | | Date | Mon, 11 Sep 2006 18:24:52 +0100 |
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Ar Llu, 2006-09-11 am 17:38 +0100, ysgrifennodd Andrew Bird: > Alan > Yes, I have low_latency set for kernels lower than 2.6.17. I'm currently > testing using 2.6.15. When you mention 'write method for flow control' do you > mean for software XON/XOFF etc?
Yes
Basically in low_latency the following is valid
driver receives bytes flush_to_ldisc ldisc calls driver write methods
That means if you have a shared lock for read/write you want to drop it after you've bashed the hardware and before you flush_to_ldisc. Remember the IRQ handler is not re-entrant so another IRQ of the same number won't cause further I/O and out of order receives.
Alan
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