I've been using a character device on linux in my home directory named 'zero' that is a copy of the 'zero' device in /dev: crwxrwxrw- 1 1, 5 Jun 15 2015 zero
to do read benchmarks using 'dd' (and write benchmarks using a file named 'null' thats a copy of /dev/null). I run it "occasionally", but not on a regular basis, since it stays a bit boring. Nevertheless, ballpark numbers consistent with historical norms verify correct network function (separate from read/write files). Read/write speeds at last check a few weeks ago were typical with reads at 700MB/s and writes at about 300MB/s. A few hours ago I tried it again due to some strange network probs where I seemed to be getting file xfer speeds as low as 200K/s. I tried the bench script, and its half broken now -- because I can no longer get anything back from the zero device on my server via the network. Locally, I can do 'dd' from /dev/zero (or the zero file) and it takes a few seconds and gave about 800MB/s. So seemed to have been working fine, but remotely -- still nada... reads 0 bytes from /dev/zero and about 300MB/s write speed. Can anyone think of anything that might have changed in cygwin such that it would know the remote device is a "/dev/zero". Wondered if the 'dd' prog might have changed, but just realize it did same with 'cat' as well. Anyway -- I'm a bit stumped as to possible causes... The writing to a remote /dev/null part is still working, so not sure why one would change and not the other. If anyone can think of anything, please let me know -- I'm also gonna ping the samba list and maybe my distro list Thanks! -linda -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
