Re: AFP tuning
Re: AFP tuning
- Subject: Re: AFP tuning
- From: Justin Walker <email@hidden>
- Date: Sun, 11 Apr 2004 17:02:15 -0700
On Apr 11, 2004, at 16:05, Dario wrote:
Hi All,
I'm fiddling around with AppleFileServer trying to improve
performance.
Using ktrace, a modified netstat that shows window size and tcpdump,
I can see that afp is doing ~12k writes (8 packets of 1448 each per
sequential tcp burst), using only one tcp socket for all transfers,
and setting a fairly anemic window size of 64k (although in the
actual transfer, I see it's 32k)
There is not only the tcp frame size to care of, it seems that the
data is sent throught a ethernet interface, since it's mtu is
1500byte. try increasing it to the jumbo size (9600) and the tcp
packet will be longer
It's generally not that simple.
You can't just set your interface to 'jumbo packet' mode; there has to
be something connected to your interface that can handle jumbo frames,
and the "other system" either has to be more-or-less directly connected
to that device, and speak jumbo frames; or there has to be an
intervening router, in which case you have transferred the burden to
the router, which generally is ill-prepared to deal with a lot of
fragmentation. In the latter case, you haven't improved things much.
Regards,
Justin
--
Justin C. Walker, Curmudgeon-At-Large *
Institute for General Semantics | Some people have a mental
| horizon of radius zero, and
| call it their point of view.
| -- David Hilbert
*--------------------------------------*-------------------------------*
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