RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP
ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established
h.schmalzbauer at omnilan.de
Thu Feb 18 16:04:38 UTC 2010
Stephen Hurd schrieb am 18.02.2010 17:01 (localtime):
> Harald Schmalzbauer wrote:
>> Some experimental results:
>> When rsyncing with windows, and FreeBSD is receiver, I see the same
>> ACK ever two segemnts, but speed is at 72MB/s.
>> When FreeBSD is sender and Windows is receiver, it looks more I
>> expected. There are about 20 data segments before a ACK is returned.
>> And there are TCP Window Update Segments, reflecting smaller receiver
>> buffers on the windows side. But this happens at a throughput of
>> 82MB/s!!! So the windows machine is behaving like I understand the TCP
>> flow control.
>> Any explanation why the FreeBSD machine seems to ignore window size?
> IIRC, the delayed ACK RFC requires an ACK at least every second segment.
Good hint, but disabling leads to ACK after every single data segment ?!?
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 196 bytes
Desc: OpenPGP digital signature
Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20100218/6560805c/signature.pgp
More information about the freebsd-stable