Messages in this thread | | | Date | Sun, 13 Jan 2002 14:34:04 +0100 | From | Roman Zippel <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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Hi,
Alan Cox wrote:
> disable_irq only blocks _one_ interrupt line, spin_lock_irqsave locks the > interrupt off on a uniprocessor, and 50% of the time off on a > dual processor. > > If I use a spin lock you can't run a modem and an NE2000 card together on > Linux 2.4. Thats why I had to do that work on the code. Its one of myriads > of basic obvious cases that the pre-empt patch gets wrong
I wouldn't say it gets it wrong, the driver also has to take a non irq spinlock anyway, so the window is quite small and even then the packet is only delayed. But now I really have to look at that driver and try a more optimistic irq disabling approach, otherwise it will happily disable the most important shared interrupt on my Amiga for ages.
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