-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 This sounds a lot like a physical layer issue -- most notably a speed/duplex issue. Any time I've seen a large number of retransmits occur during heavy load, this is what I suspect. That said, I don't know what type of interconnect you're using. Tell us more about your configuration. - -Collin Dai, Manhong wrote: > > > Hi, > > > I found the aggregated IO speed is only about 100MB/s on 4 Giga-bit > Brick. This test is done over 12 computing nodes with command dd > if=/dev/zero of=bar bs=1048576 count=20480. Because our brick has very > fast local IO speed, the problem could be network. > > > Then I found computing nodes got too many retransmited segments > during test according to netstat -st. The retransmission ratio is > about 5%, but brick node has a normally low transmission rate. > > > Could some shed some light? > > Best, > Manhong > > ------------------------------------------------------------------------ > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://zresearch.com/cgi-bin/mailman/listinfo/gluster-users > -----BEGIN PGP SIGNATURE----- Version: PGP Universal 2.6.3 Charset: ISO-8859-1 wsBVAwUBSLK2gfvgUY49IQeAAQjErwf/ZWFWZTjWUCNpTWdU94VgxmcEaD4zT3P2 I6KyfYL68Mwwdr/8leQoJbghpWupapMxSUa8KB8HA9V/56cZFye4irf97Z9b+TT1 5/hF1iqhfK2tnEADOB9G8fSY8ptzbSfV9yDbuNTWl+Tz8mzErDYf6UsxGn3bZOv5 xb/7rvOkGq5rhG0WLUQYGUEuU1QptUfu6vvohfVciGaEdbL1SHYy+rSDxSrexFS4 mRgT/sBxainKy0mSwq5D8cYt8flbsFATZ582vnRBj6UfzWoZEyEpCjKoLqJEWuWn rpa8HhEhc5vm2GnQXIE9iXO9vCLMi4Y76sJpDtR/3hnu6mlrQEq4NA== =0EPQ -----END PGP SIGNATURE-----
