net.inet.tcp.slowstart_flightsize in 8-STABLE

[Andre Oppermann]

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