Messages in this thread | | | Date | Tue, 3 Jun 1997 19:54:31 -0400 | From | "David S. Miller" <> | Subject | Re: kernel > 2.1.36 & nfs |
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Date: Tue, 3 Jun 1997 16:50:55 -0700 (PDT) From: Linus Torvalds <torvalds@transmeta.com>
Note that this is a different VM trick from the one that uses _kernel_ virtual memory to actually make the packet look contiguous in kernel memory even though we only allocate one page at a time.
Alan was advocating something that approaches "vmalloc()" (not quite, but it had some of the same properties), and that I'm dead set against.
Oh, ok, Alan that's a stupid idea, listen to pinhead ;-)
While I'm at it, I will advocate that using a chaining mechanim that might even look something like BSD MBUF chains, but _ONLY_ for > PAGE_SIZE MTU's devices, makes a _lot_ of sense. For < PAGE_SIZE MTU'd devices (ie. ethernet) it makes no sense and that is why we should continue to do what we do now for them. Except of course when a huge fragmented thing comes in, then the frag code builds the chains and passes them up as if this was some huge packet coming from a >PAGE_SIZE MTU'd device, the upper layers do not even need to know the difference.
---------------------------------------------//// Yow! 11.26 MB/s remote host TCP bandwidth & //// 199 usec remote TCP latency over 100Mb/s //// ethernet. Beat that! //// -----------------------------------------////__________ o David S. Miller, davem@caip.rutgers.edu /_____________/ / // /_/ ><
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