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From: Florian Weimer <fweimer@bfk.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Axel Waggershauser <awagger@web.de>
Cc: pgsql-performance@postgresql.org
Subject: Re: Low throughput of binary inserts from windows to linux
Date: Tue, 12 Dec 2006 08:39:16 +0100
Message-ID: <82vekhwokb.fsf@mid.bfk.de> (raw)
In-Reply-To: <21549.1165886726@sss.pgh.pa.us>
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	<21549.1165886726@sss.pgh.pa.us>

* Tom Lane:

> If you don't like that theory, another line of reasoning has to do with
> the fact that the maximum advertiseable window size in TCP is 65535 ---
> there could be some edge-case behaviors in the Windows and Linux stacks
> that don't play nicely together for 64K transfer sizes.

Linux enables window scaling, so the actual window size can be more
than 64K.  Windows should cope with it, but some PIX firewalls and
other historic boxes won't.

-- 
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99



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