DSM-G600, DNS-3xx and NSA-220 Hack Forum
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#1 2011-03-11 03:04:51
- dhub
- Member
- Registered: 2011-01-01
- Posts: 112
Network settings for better performance
I'm running debian squeeze, but I suspect these changes would help on other reloaded kernels or the default firmware.
I change my mtu to 9000 (obvious)
my txqueue length to 2000 (I suspect this is making most of the difference)
and turned off sack
ifconfig eth0 mtu 9000 txqueuelen 2000
echo 0 > tcp_sack
iperf is now showing me getting 49.2MB/s instead of 22MB/s. Which cut my drbd sync time in half :-)
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#3 2011-03-11 07:35:26
- bound4h
- Member
- Registered: 2010-04-12
- Posts: 209
Re: Network settings for better performance
Do you have iperf running as a server on the DNS-323 and then connecting to it via client PC?
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#4 2011-03-11 07:51:56
- dhub
- Member
- Registered: 2011-01-01
- Posts: 112
Re: Network settings for better performance
I ran "iperf -s" on a server connected to the GB switch and "iperf -c server" on the dns-323
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#5 2011-03-11 15:35:06
- fordem
- Member
- Registered: 2007-01-26
- Posts: 1938
Re: Network settings for better performance
bjby wrote:
49.2MB/s, that must be some sort of dns323 world record. Nice. I am foreseeing this tread to be a long one.
Nah - I've topped that, but just barely - but you can only achieve that sort of data rate in a "silicon~silicon" test (iperf just tests the network throughput) as soon as you start to read/write the physical drives, you're going to see the throughput tank.
My tests were done using iXia's QCheck.
Last edited by fordem (2011-03-11 15:35:46)
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