Re: RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]]

[Harald Schmalzbauer]

Stephen Hurd schrieb am 18.02.2010 17:01 (localtime):

Harald Schmalzbauer wrote:

Some experimental results:

Any explanation why the FreeBSD machine seems to ignore window size?

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.

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 ?!?

Thanks,

-Harry

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