On Fri, Aug 7, 2009 at 2:11 AM, Henrik Johansen<henrik at scannet.dk> wrote: > TCP window set to 1024000 : > A simple cp yields ~82 mb/s > A simple mv yields ~86 mb/s
Seems odd that there would be such a big difference. Which cp are you using? With a 5 MB file copying from /tmp to /var/tmp I observe: - /usr/bin/cp opens both files, mmap(s) the first one, then does a single write. - /usr/gnu/bin/cp skips the mmap and loops through reading and writing 128 KB chunks. -- Mike Gerdts http://mgerdts.blogspot.com/
