On 27.09.2010 10:12, Maxim Dounin wrote:
Hello!
On Mon, Sep 13, 2010 at 09:24:53PM +0400, Maxim Dounin wrote:
[...]
Andre, could you please take a look at one more patch as well?
Igor reported that it still sees 100ms delays with rfc3465 turned
on, and it turns out to be similar issue (setting cwnd to 1*MSS)
for hosts found in hostcache.
The problem with setting cwnd from hostcache was already reported
here:
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/92690
http://lists.freebsd.org/pipermail/freebsd-net/2007-July/014780.html
As using larger cwnd from hostcache may cause problems on
congested links (see second thread) I changed code to only use
cached cwnd as an upper bound for cwnd (instead of fixing current
code). This is also in-line with what we do on connection
restarts.
We may later consider re-adding usage of larger cwnd from
hostcache. But I believe it should be done carefully and
probably behind sysctl, off by default.
Ping.
Thanks for the reminder. I'll disable priming CWND from hostcache.
--
Andre
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