On Iau, 2005-02-03 at 16:32, Thomas Denier wrote: > into slow start mode. My rough calculations indicate that a one percent > loss rate will limit throughput to something like a tenth of the nominal > speed of the connection. However, we are seeing something like a > thousandth of the nominal speed. Does z/OS Linux have unusually severe > problems coping with lost packets?
Your maths disagrees with mine. For an old style VJ stack you would be right only if the congestion window was one frame I think. For a modern stack like Linux you'd be wrong all around. Linux supports FACK/SACK which means it can do smart things with acknowledgements including acking sequences with gaps and determining whether something appears to be congestion or link loss. Except on an LFN 1% shouldn't really matter. Ping is however not testing throughput merely odd packets so it may be that if you have real congestion ping is showing a very optimistic view of the network. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
