ethernet speed limit
jeffs at kant.ee.washington.edu
Thu Jun 15 09:24:57 PDT 2000
Kjell Konis wrote:
> Is there any way limit ethernet speeds? Basically what I want to do is
> alias my ethernet interface (ie eth0:1, eth0:2, etc) then have eth0:x
> limited to 256kbps. TIA.
Why would you want to?
Ethernet is multiple access, so if you want to limit the amount of
bandwidth a single communications channel uses, you have to throttle the
channel somehow. That isn't always easy. When I was at Mathsoft, we had
a backup system which was multithreaded and it would saturate the
ethernet. A bunch of processes scheduled for midnight would be unable to
function because there were a lot of network delays. We finally
rescheduled all of the "midnight" processes for 23:50 and we rescheduled
the backups to stagger their starting times. The network would be busy
from about 21:00 until 24:00, and then it would saturate until about 06:30
the next morning and taper off to no load by 7:30. But that was all done
at the application level.
Jeff Silverman, sysadmin for the Research Computing Systems (RCS)
University of Washington, School of Engineering, Electrical Engineering Dept.
Box 352500, Seattle, WA, 98125-2500
jeffs at isdl.ee.washington.edu
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