Re: fix TCP roundtrip time update code

David S. Miller
2003-06-04T03:12:45Z

From: Nivedita Singhvi <niv@us.ibm.com>
Date: Tue, 03 Jun 2003 19:01:25 -0700

But, FYI, DaveM and Alexey, we tried
reproducing the stalls we (Dave Hansen, Troy Wilson) had
seen during SpecWeb99 runs and couldn't reproduce them on
2.5.69. (Same config, etc). So its possible our hang/stalls
were some other issue that got silently fixed (or more
likely, possibly the same thing but other changes minimized
us running into the problem).

I think this means nothing, and that you can infer nothing from such
results.

My understanding is that the problem case triggers only when a timeout
based retransmit occurs. On LAN this tends to be extremely rare.
Although under enough traffic load it can occur.

So if your old SpecWEB99 lab tended more to trigger timeout based
retransmits on LAN, and your new test network does not, then your new
test network will tend to not reproduce the bug regardless of whether
the bug is present in the kernel or not :-)