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protocol validity checksprotocol validity checksPosted Feb 3, 2006 4:15 UTC (Fri) by zblaxell (subscriber, #26385)In reply to: protocol validity checks by cventers Parent article: Van Jacobson's network channels
kernel can check it out in place...while the user, maybe on another CPU, switches a few bits just after the kernel check but before the network card picks up the data.
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Sneaky indeed! Posted Feb 3, 2006 5:48 UTC (Fri) by xoddam (subscriber, #2322) [Link] Ok, freely mapped memory doesn't cut it then. I wonder what theperformance impact of changing packet buffers' page permissions would be, relative to copying (and relative to keeping the TCP implementation in kernel space)?
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