Guys he's only pushing 120mb/s over the loopback. That's totally lame. Sorry, but there's something wrong in the software stack. All the comments about hardware

Guys he's only pushing 120mb/s over the loopback. That's totally lame. Sorry, but there's something wrong in the software stack. All the comments about hardware, caches, blah blah are just FUD. Locked to a single CPU, he should be pushing well over this (like nearing an order of magnitude) if the software / stack was doing the correct thing. Do your math, or read my comment when it arrives on the article. You can reproduce this bandwidth usage in slow ass languages like ruby, and I've done so many times. Btw. it's ~120MB/s he's peaked at. DDR2 peaks at what in the region of 10GB/s? i7's architecture should totally murder that, iirc. raggi@mbk: ~/volatile % time dd if=/dev/zero of=bigfile bs=1048576 count=500 500+0 records in 500+0 records out 524288000 bytes transferred in 1.527235 secs (343292283 bytes/sec) real 0m1.532s user 0m0.003s sys 0m0.796s raggi@mbk: ~/volatile % time sh -c "cat bigfile | cat - > bigfile2" real 0m2.846s user 0m0.117s sys 0m2.185s raggi@mbk: ~/volatile % time sh -c "cat bigfile | cat - > bigfile2" real 0m2.363s user 0m0.116s sys 0m2.161s