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AFP tuning
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AFP tuning

  • Subject: AFP tuning
  • From: Steve Modica <email@hidden>
  • Date: Sat, 10 Apr 2004 08:24:18 -0500
  • Organization: Small Tree Communications
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)

Here's a short burst:

08:14:57.552720 IP (tos 0x0, ttl 64, id 10531, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 1168:2616(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.553335 IP (tos 0x0, ttl 64, id 10532, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 2616:4064(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.553640 IP (tos 0x0, ttl 64, id 10533, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 4064:5512(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.553951 IP (tos 0x0, ttl 64, id 10534, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 5512:6960(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.554266 IP (tos 0x0, ttl 64, id 10535, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 6960:8408(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.554573 IP (tos 0x0, ttl 64, id 10536, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 8408:9856(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.554884 IP (tos 0x0, ttl 64, id 10537, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 9856:11304(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>
08:14:57.555210 IP (tos 0x0, ttl 64, id 10538, offset 0, flags [DF], length: 1500) 192.168.1.100.afpovertcp > 192.168.1.103.49236: . 11304:12752(1448) ack 579 win 32768 <nop,nop,timestamp 3673937391 3937036659>

Here's the window size:

spongebob:/Users/modica root# ./ns
Active Internet connections
Proto Recv-Q/Window Send-Q/Window Local Address Foreign Address (state)

tcp4 0/ 65536 0/ 65536 192.168.1.103.afpovert 192.168.1.100.49331 ESTABLISHED
tcp4 0/ 66608 0/ 66608 192.168.1.103.49236 192.168.1.100.afpovert ESTABLISHED

I found some documentation refering to parameters being set in NetInfo manager under /config/AppleFileServer but when I attempted to set TCPQuantum in there, it was just ignored (even after a reboot). Are these values simply hardcoded into the daemon? Can one set things like afpTCPPort and TCPQuantum or are they just ignored?

Best Regards!
Steve
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