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Forum Discussion
Post your performance results
I thought it might be interesting to see what kind of performance everyone is getting with IO Meter so that we can compare what we're getting. So I thought we could all post our results in this thread...
using iMac core2Duo 2.33Ghz 24inch
DLINK DIR 655 wireless router/gigabit switch
ReadyNAS NV+ 1GB, 4 500GB Seagates from the compatibility list (nice and silent those ones!)
Enable Write Cache, Disable Full Journaling, Enable Fast Writes
CAT5 cables
applied
sysctl -w net.inet.tcp.delayed_ack=0
from
http://www.infrant.com/wiki/index.php/F ... _can_do.3F
A dump of my results as I went (quite approximate numbers - I was copying a 100MB file back and forth):
over DLINK DIR 655 wireless router/gigabit switch
(ReadyNAS Jumbo frames ON)
Mac AFP
read 22MBs
write 4MBs
Mac SMB
read 13MBs
write 10MBs
direct connect between Mac and NAS
Mac AFP
30MBs read
5MBs write
not a huge improvement compared to passing through the router/switch
Mac SMB
11MBs read
9MBs write
Mac Jumbo frames ON, still direct connect
[To enable jumbo gigabit Ethernet frames on the iMac (up to 9000 bytes), you have to select the "jumbo" maximum packet size in System Preferences:Network:Built-in Ethernet:Ethernet. There is an outdated Apple article explaining which devices supported jumbo frames as of the date of the article (4/22/04):
http://docs.info.apple.com/article.html?artnum=107962]
AFP
read 25MBs
write 30MBs
serious write boost!
SMB
read 11MBs
write 15MBs
not much better
Mac and NAS Jumbo Frames ON, this time through dlink DIR655
AFP (forget SMB)
read 25MBs
write 5MBs
uh-oh, back to square 1
Jumbo frames OFF on Mac AND NAS
AFP
read 25MBs
write 20MBs
ah-ha - back to 'high' write speeds
The DIR655 clearly does not do good with Jumbo frames. Best to set everything back to MTU 1500 in System Preferences:Network:Built-in Ethernet:Ethernet, AND (very importantly) switch off Jumbo on the NAS, too. Use AFP, not SMB of NFS.
I'm getting myself a SMC_8508T switch to cope with the Jumbo frames, and CAT6 cables to replace my existing CAT5 cables.
http://www.theinquirer.net/default.aspx?article=32053
http://www.lsc-group.phys.uwm.edu/beowu ... mance.html
http://www.smc.com/index.cfm?event=view ... =&pid=1147
Still, I'm not too impressed with the speeds - I want to get to the highs I see on this thread (50MBs). The direct connection with Jumbo frames ON is pretty much the max performance I can expect from my NAS connected to my Mac. Or am I wrong? Anyone know how to boost my performance further? Maybe tune the MTU on the mac to about 7000 instead of 9000, to match the NAS speed better? I'll try that when I get my new switch.
DLINK DIR 655 wireless router/gigabit switch
ReadyNAS NV+ 1GB, 4 500GB Seagates from the compatibility list (nice and silent those ones!)
Enable Write Cache, Disable Full Journaling, Enable Fast Writes
CAT5 cables
applied
sysctl -w net.inet.tcp.delayed_ack=0
from
http://www.infrant.com/wiki/index.php/F ... _can_do.3F
A dump of my results as I went (quite approximate numbers - I was copying a 100MB file back and forth):
over DLINK DIR 655 wireless router/gigabit switch
(ReadyNAS Jumbo frames ON)
Mac AFP
read 22MBs
write 4MBs
Mac SMB
read 13MBs
write 10MBs
direct connect between Mac and NAS
Mac AFP
30MBs read
5MBs write
not a huge improvement compared to passing through the router/switch
Mac SMB
11MBs read
9MBs write
Mac Jumbo frames ON, still direct connect
[To enable jumbo gigabit Ethernet frames on the iMac (up to 9000 bytes), you have to select the "jumbo" maximum packet size in System Preferences:Network:Built-in Ethernet:Ethernet. There is an outdated Apple article explaining which devices supported jumbo frames as of the date of the article (4/22/04):
http://docs.info.apple.com/article.html?artnum=107962]
AFP
read 25MBs
write 30MBs
serious write boost!
SMB
read 11MBs
write 15MBs
not much better
Mac and NAS Jumbo Frames ON, this time through dlink DIR655
AFP (forget SMB)
read 25MBs
write 5MBs
uh-oh, back to square 1
Jumbo frames OFF on Mac AND NAS
AFP
read 25MBs
write 20MBs
ah-ha - back to 'high' write speeds
The DIR655 clearly does not do good with Jumbo frames. Best to set everything back to MTU 1500 in System Preferences:Network:Built-in Ethernet:Ethernet, AND (very importantly) switch off Jumbo on the NAS, too. Use AFP, not SMB of NFS.
I'm getting myself a SMC_8508T switch to cope with the Jumbo frames, and CAT6 cables to replace my existing CAT5 cables.
http://www.theinquirer.net/default.aspx?article=32053
http://www.lsc-group.phys.uwm.edu/beowu ... mance.html
http://www.smc.com/index.cfm?event=view ... =&pid=1147
Still, I'm not too impressed with the speeds - I want to get to the highs I see on this thread (50MBs). The direct connection with Jumbo frames ON is pretty much the max performance I can expect from my NAS connected to my Mac. Or am I wrong? Anyone know how to boost my performance further? Maybe tune the MTU on the mac to about 7000 instead of 9000, to match the NAS speed better? I'll try that when I get my new switch.
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