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09-29-2007 12:42 AM
09-29-2007 12:42 AM
performance: tcp window size not effective
I have a ftp transfer (4 GB of gzipped data) between 2 HP-UX boxes (IA 64 11iv2 and PA 11i) distant by 270 ms over a DS3 WAN.
Transfers do not go over 2Mb/s even after raising tcp window (recv and xmit) size to 157286 on both sides . (ndd -set /dev/tcp tcp_xmit_hiwater_def and tcp_recv_hiwater_def
When tcpdumping the connection I see a 39321 window size . Both machines are connected to the LAN with Gb fiber cards.
Ftpd is HP-Ux 11iv2 wu-ftp 2.6.1 (PHNE 34036).
Any idea ?
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09-29-2007 01:16 AM
09-29-2007 01:16 AM
Re: performance: tcp window size not effective
You might get better answers faster in an
HP-UX forum than you will in this Tru64 forum.
http://forums1.itrc.hp.com/service/forums/familyhome.do?familyId=117
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09-29-2007 01:19 AM
09-29-2007 01:19 AM
Re: performance: tcp window size not effective
Already done.
Thx
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09-29-2007 05:17 AM
09-29-2007 05:17 AM
Re: performance: tcp window size not effective
Still limited transfer rate to max 2Mb/s even if I have found out the "window scale" parameter to go over the 16 bits limit of the windows size TCP option.
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09-29-2007 11:17 AM
09-29-2007 11:17 AM
Re: performance: tcp window size not effective
Hoping you use Tru64 V5, you can check the current speed and duplex configuration with:
hwmgr get attr -cat network | grep -E "name|speed|duplex|auto"
If you manually set the switch speed to 100 MB FD, then force it also in the operating system:
/usr/sbin/lan_config -i
Add that line to /etc/inet.local also so it's persistent across reboots.
Speed and duplex problems cause slow tranfer rate and also, a lot of errors/collisions in the output of:
netstat -ni
Welcome to the forum and don't forget to assign points to the answers you get.
Have a nice day.