Re: 2.1.131-ac3 3c509 no irq_save in the sender code

Andrea Arcangeli (andrea@e-mind.com)
Wed, 9 Dec 1998 07:35:46 +0100 (CET)

On Mon, 7 Dec 1998, Alan Cox wrote:

>> I don' t understand very well the meaning of `tx is single threaded
>> implicitly'...
>
>All transmits are serialized by the dev_queue_xmit() area code. There
>is a start_bh_atomic around them. Thats something that has to go for
>2.3.x but for 2.2 is quite safe

Ok, but now I can' t understand why the tx can be interrupted by the rx
irq handler in UP safely but not in SMP... What am I mussing here?

Andrea Arcangeli

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