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тАО12-06-2010 03:53 AM
тАО12-06-2010 03:53 AM
Extreme Outbound Queue Length
Hi
We have an rx8640 that have an extreme outbound queue length:
tsiv@whisky|pts/12:/home/tsiv$ while : ; do lanadmin -g mibstats 5| grep "Outbound Queue Length" ; sleep 5 ; done
Outbound Queue Length = 27
Outbound Queue Length = 87
Outbound Queue Length = 33
Outbound Queue Length = 8
Outbound Queue Length = 24
Outbound Queue Length = 17
Outbound Queue Length = 17
Outbound Queue Length = 8
Outbound Queue Length = 123
Outbound Queue Length = 14
Outbound Queue Length = 32
Outbound Queue Length = 11
Outbound Queue Length = 21
Outbound Queue Length = 4
Outbound Queue Length = 41
Outbound Queue Length = 20
Outbound Queue Length = 18
Outbound Queue Length = 6
Outbound Queue Length = 60
Outbound Queue Length = 71
Outbound Queue Length = 41
Outbound Queue Length = 56
Outbound Queue Length = 13
But this is a 10GB interface and the interface does not seem saturated.
Any ideas on the cause? This is a highly loaded machine in every sense.
We have an rx8640 that have an extreme outbound queue length:
tsiv@whisky|pts/12:/home/tsiv$ while : ; do lanadmin -g mibstats 5| grep "Outbound Queue Length" ; sleep 5 ; done
Outbound Queue Length = 27
Outbound Queue Length = 87
Outbound Queue Length = 33
Outbound Queue Length = 8
Outbound Queue Length = 24
Outbound Queue Length = 17
Outbound Queue Length = 17
Outbound Queue Length = 8
Outbound Queue Length = 123
Outbound Queue Length = 14
Outbound Queue Length = 32
Outbound Queue Length = 11
Outbound Queue Length = 21
Outbound Queue Length = 4
Outbound Queue Length = 41
Outbound Queue Length = 20
Outbound Queue Length = 18
Outbound Queue Length = 6
Outbound Queue Length = 60
Outbound Queue Length = 71
Outbound Queue Length = 41
Outbound Queue Length = 56
Outbound Queue Length = 13
But this is a 10GB interface and the interface does not seem saturated.
Any ideas on the cause? This is a highly loaded machine in every sense.
2 REPLIES 2
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тАО12-06-2010 04:28 AM
тАО12-06-2010 04:28 AM
Re: Extreme Outbound Queue Length
Shalom,
Use lanadmin -x ##
replace the ## with the numeric part of lan## and lets see what connect speed this NIC is getting.
Use lanscan to find the active lan port for this card.
Frequently this issue is due to switch or other system configuration not permitting good speed.
I would also like to know a little about the switch environment, the OS and update level and such to put together a more clear set of recommendations.
I would ask the network people to check the switch for errors.
SEP
Use lanadmin -x ##
replace the ## with the numeric part of lan## and lets see what connect speed this NIC is getting.
Use lanscan to find the active lan port for this card.
Frequently this issue is due to switch or other system configuration not permitting good speed.
I would also like to know a little about the switch environment, the OS and update level and such to put together a more clear set of recommendations.
I would ask the network people to check the switch for errors.
SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО12-06-2010 03:51 PM
тАО12-06-2010 03:51 PM
Re: Extreme Outbound Queue Length
There are two (perhaps three) possible 10GbE NICs in an rx8640 - which do you have installed?
FWIW, a NIC can have at least two limits - one is a bandwidth limit - as in megabits per second or whatever units you might prefer. Another is a packet per second limit. Can you include some statistics to show the bites/bytes per second and packets per second through the interface?
For outbound, the NIC can only pull packets from the host as fast as they can be DMA'd from the host, so there is a chance that the NIC isn't the bottleneck - still want to see the model of NIC being used though.
FWIW, a NIC can have at least two limits - one is a bandwidth limit - as in megabits per second or whatever units you might prefer. Another is a packet per second limit. Can you include some statistics to show the bites/bytes per second and packets per second through the interface?
For outbound, the NIC can only pull packets from the host as fast as they can be DMA'd from the host, so there is a chance that the NIC isn't the bottleneck - still want to see the model of NIC being used though.
there is no rest for the wicked yet the virtuous have no pillows
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