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04-06-2011 01:53 PM
04-06-2011 01:53 PM
1810g-24 latency, lag, pain
I am an owner of a 1810g-24 switch. I am having a significant latency problem that I can't figure out.
I use a PXE boot server to image PC's remotely. I put it on a test bed with a cheapo linksys switch and have been able to deploy and upload images over the network in about 20 minutes.
Moving toward using it in a working environment, I connected it to this 1810g-24 switch, and times went from 20 minutes to 5 hours.
Just to make sure I wasn't introducing other variables, I grabbed that same cheap linksys 4 port switch and swapped the cables over to it and now I'm back at 20 minutes. I've also tried using the same cables and ran them to our Cisco catalyst and the times are slightly less even.
Is there a setting in the HP switch that would cause this kind of symptom? There are no other workstations on the switch. Just my PXE server and my test mule workstation.
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04-07-2011 02:07 PM
04-07-2011 02:07 PM
Re: 1810g-24 latency, lag, pain
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04-11-2011 08:18 AM
04-11-2011 08:18 AM
Re: 1810g-24 latency, lag, pain
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04-13-2011 02:18 PM
04-13-2011 02:18 PM
Re: 1810g-24 latency, lag, pain
raj@raj-8510w:~$ tftp 192.168.1.2
tftp> get K_15_03_0007.swi
Received 13799190 bytes in 2.0 seconds
tftp> get K_15_03_0007.swi
Received 13799190 bytes in 2.0 seconds
tftp> get K_15_03_0007.swi
Received 13799190 bytes in 2.0 seconds
tftp> get K_15_03_0007.swi
Received 13799190 bytes in 1.9 seconds
tftp> get K_15_03_0007.swi
Received 13799190 bytes in 1.9 seconds
and it was like that for the various combinations of ports I was using.
BTW, here are the salient performance specs from the quickspecs:
http://h18000.www1.hp.com/products/quickspecs/13447_div/13447_div.HTML#Technical%20Specifications
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04-18-2011 02:37 AM
04-18-2011 02:37 AM
Re: 1810g-24 latency, lag, pain
It may be worth just forcing the speed to 100-full even if it looks ok, just as a test.
Also, are you using multicast with your PXE server? If so you may want to enable IGMP (snooping) on the relevant VLAN.
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04-18-2011 10:48 AM
04-18-2011 10:48 AM
Re: 1810g-24 latency, lag, pain
I applied the update. You need to update to 1.20 first which I had to get from them also.
The update did not solve the problem.
I turned 'flow control' on and the switch suddenly sped up immensely. I was under the impression that turning flow control on might slow things down because of the heavy traffic that would occur in my situation.
Although the speed is now acceptable, the imaging process does pause periodically for a few seconds. This must be the flow control kicking in, because this doesn't happen on other switches I've used.
Thanks
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04-18-2011 10:58 AM
04-18-2011 10:58 AM
Re: 1810g-24 latency, lag, pain
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04-18-2011 11:30 AM
04-18-2011 11:30 AM
Re: 1810g-24 latency, lag, pain
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