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

[David S. Miller]

Andrew Morton writes:
 > The box has 130 mbyte/sec memory write bandwidth, so saving
 > a copy should save 10% of this.   (Wanders away, scratching
 > head...)

Are you sure your measurment program will account properly
for all system cycles spent in softnet processing?  This is
where the bulk of the cpu cycle savings will occur.

Later,
David S. Miller
[e-mail]