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Check list for performance tuning (mainly gige)
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Author: Bela Ban, Eric
For the transmit queue:
$ /sbin/ifconfig [eth0|eth1]
The txqueue size is currently 1000.
To get the kernel queue size for incoming packets:
$ sysctl -a | grep net.core.netdev_max_backlog
For socket buffer info:
$ sysctl -a | grep net.core
net.core.divert_version = 0.46
net.core.hot_list_length = 128
net.core.optmem_max = 10240
net.core.message_burst = 50
net.core.message_cost = 5
net.core.mod_cong = 290
net.core.lo_cong = 100
net.core.no_cong = 20
net.core.no_cong_thresh = 20
net.core.netdev_max_backlog = 300
net.core.dev_weight = 64
** these are the default and max sizes for socket buffer memory
net.core.rmem_default = 65535
net.core.wmem_default = 65535
net.core.rmem_max = 131071
net.core.wmem_max = 131071
Here are some other links:
Squeeze Your Gigabit NIC for Top Performance
http://www.enterpriseitplanet.com/networking/features/article.php/3497796
How to achieve Gigabit speeds with Linux
http://datatag.web.cern.ch/datatag/howto/tcp.html
Enabling High Performance Data Transfers
http://www.psc.edu/networking/projects/tcptune/
>> #2 What's the MTU (do you use jumbo frames, or the regular 1500b) ?
In general, we have not tuned this environment. This needs to be
addressed as part of the QA Lab upgrades we're targeting for next
month. I'll be creating some Jira tasks and working with Ryan's
team on this, so we should discuss the network needs along with
other system relates topics (oracle tuning, etc.).
Regular 1500 for now. We need to revisit this for some upcoming QA lab
updates were doing. If we need a dedicated GIGE switch for testing,
we need to get this in the budget (I think it's worth the 1.5k myself).
If we can't get a dedicated switch, we'll see if we can enable the
jumbo frames on the private side subnet (but this requires ALL connected
machines be gige w/ jumbo frame support - not an issue w/ the current
hw, but something to think about).
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