Messages in this thread |  | | Date | Thu, 2 Jan 2003 14:28:16 -0800 | From | Larry McVoy <> | Subject | Re: [PATCH] TCP Zero Copy for mmapped files |
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> > 1) Does not handle writes that straddle multiple VMAs > > What exactly do you mean? In my test, files larger than a > page were handled perfectly, as well.
mmap(file1 at location [a,b) mmap(file2 at location [b,c) write(sock, a, (size_t)(c - a));
> However, I didn't like the VM waste either, but I believe there > is no other way.
The VM cost hurts. Badly. Imagine that the network costs ZERO. Then the map/unmap/vm ops become the dominating term. That's why it is a fruitless approach, it still has a practical limit which is too low. -- --- Larry McVoy lm at bitmover.com http://www.bitmover.com/lm - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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