Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)

From: David S. Miller (
Date: Fri Feb 02 2001 - 18:31:41 EST

David Lang writes:
> right, assuming that there is enough sendfile() benifit to overcome the
> write() penalty from the stuff that can't be cached or sent from a file.
> my question was basicly are there enough places where sendfile would
> actually be used to make it a net gain.

There are non-performance issues as well (really, all of these points
have been mentioned in this thread btw). One is that since paged
SKBs use only single-order page allocations, the memory allocation
subsystem is stressed less than the current scheme where SLAB
allocates multi-order pages to satisfy allocations of linear SKB data

This has consequences and benefits system wide.

David S. Miller
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:16 EST