Hello Matthew, Isn't there a 40MB/s limit on SCSI ? I think u3 is 80 but maybe just check on the controller. If you had huge memory (1gig+) you could cache the file in memory and transfer from there and check.
Cheers, Pieter -----Original Message----- From: Matthew Boeckman [mailto:[EMAIL PROTECTED]] Sent: 17 January 2002 11:03 To: [EMAIL PROTECTED] Subject: bandwidth measurements/GigE I'm running RedHat 7.1 on some Altus1240's from Penguin Computing. All have identical GigE Nic's. All are connected via a Cisco Catalyst 3550 GigE switch which shows that auto-negotiation has each box happily connected at 1000/Full Duplex. The boxes themselves have 10K RPM u3SCSI drives in them. The files themselves vary from 400M-1.2Gig and were created with dd and help from /dev/zero. Here's the rub: When I transfer a file via ftp from one box to another, I seem to peak out around 35MB/s, which translates rougly to 270Mb/s. A far cry from 1000Mb/s. Is the list aware of any tools to do some more refined bandwidth tests? Or how about known issues with GigE on RH7.1 or the 2.4 kernel? I seem to get this throttle no matter how big or small the file is that I transfer. I doubt that the disk is the bottleneck. Top reports system utilization climbs up to around .8 or so, with wu-ftpd taking 30% or so of the CPU, so I likewise doubt the CPU. Any thoughts? Thanks Matthew Boeckman Systems Administrator Saepio Technologies, Inc. _______________________________________________ Redhat-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
