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Forum Discussion
Trouble shooting slow network speeds on NV
I’ve had slow transfer speeds on my internal network for some time. I’ve upgraded some hardware and run a variety of tests and I still don’t think I’m getting the speeds I should. I’m out of ideas and...
Over several days, I’ve run direct connects between the Desktop and the NV and the Laptop and NV. The IO results are wildly inconsistent and frustrating, particularly the Read speeds. Laptop results are better, but Read speeds also vary.
Just a reminder, the current settings for the NV are:
- disabled journaling & full data journaling, and enabled fast CIFs writes and fast USB disk writes.
- CIFS, NFS and Rsync are enabled in services and for all the relevant shares.
- Frontview shows gigabit is active; NV is auto negotiating.
- MTU 1500
DESKTOP DIRECT CONNECT. Best speeds were with the above settings.
Best R/W speeds were 15/19MB/sec, but the read speed, even with these same settings, varied from 6 to 15 MB/sec. Avg Read speed seemed to be about 13. There are a few restransmit errors, but not many. I noticed idle time errors, but they seemed to be linked to when I changed setting on the NV or the desktop NIC and the two devises lose their connection temporarily. After I reset error counts, and run a few tests, I’m left with a few retransmit errors and that is all.
If I enabled jumbo frames, the R/W speeds drop -- (8/11MB/sec), turned off offloading (4/18MB/sec), interrupt moderation (4/19MB/sec). Each time I’d reset defaults, the next read speed was terrible. If I ran it again, it seemed to improve a bit, more to the avg. Just now, after getting the better speeds, I let it sit for 3 hours and ran another IO meter test, the Read speed drops to 6 MB/sec. No additional errors reported in frontview. Read speeds are the biggest problem
LAPTOP DIRECT CONNECT. Speeds were better, but Read speed also varied greatly.
Best speed was 27/30MB/sec once out of 20+ tests. However, read speed varied from 11 to 30MB/sec, with some in the 15MB/sec and a few in the 27MB/sec range. With Jumbo frames, Read dropped to 11-15MB/sec. So, jumbo frames doesn’t work in direct connect with either desktop or laptop.
For the Desktop, why are the Read speeds so bad and for the laptop so inconsistent? Why are the Write speeds still below what botts suggests are a range from 25-40 MB/sec? I understand I don’t have jumbo frames on (as they never seem to work), but even so, it should be better.
On the laptop the peak speeds are in the range bott describes, but the Read speeds are wildly volatile and drop well below the expected range.
I’ve invested huge amount of time on my NV over 5 years, and I’ve always had slow speeds. Having upgraded the Desktop NIC card, I assumed that would improve, but there really seems to be a problem separate from the Actiontec Router. I am pretty exhausted from all this. I know my family is.
Off to the Superbowl now....
Just a reminder, the current settings for the NV are:
- disabled journaling & full data journaling, and enabled fast CIFs writes and fast USB disk writes.
- CIFS, NFS and Rsync are enabled in services and for all the relevant shares.
- Frontview shows gigabit is active; NV is auto negotiating.
- MTU 1500
DESKTOP DIRECT CONNECT. Best speeds were with the above settings.
Best R/W speeds were 15/19MB/sec, but the read speed, even with these same settings, varied from 6 to 15 MB/sec. Avg Read speed seemed to be about 13. There are a few restransmit errors, but not many. I noticed idle time errors, but they seemed to be linked to when I changed setting on the NV or the desktop NIC and the two devises lose their connection temporarily. After I reset error counts, and run a few tests, I’m left with a few retransmit errors and that is all.
If I enabled jumbo frames, the R/W speeds drop -- (8/11MB/sec), turned off offloading (4/18MB/sec), interrupt moderation (4/19MB/sec). Each time I’d reset defaults, the next read speed was terrible. If I ran it again, it seemed to improve a bit, more to the avg. Just now, after getting the better speeds, I let it sit for 3 hours and ran another IO meter test, the Read speed drops to 6 MB/sec. No additional errors reported in frontview. Read speeds are the biggest problem
LAPTOP DIRECT CONNECT. Speeds were better, but Read speed also varied greatly.
Best speed was 27/30MB/sec once out of 20+ tests. However, read speed varied from 11 to 30MB/sec, with some in the 15MB/sec and a few in the 27MB/sec range. With Jumbo frames, Read dropped to 11-15MB/sec. So, jumbo frames doesn’t work in direct connect with either desktop or laptop.
For the Desktop, why are the Read speeds so bad and for the laptop so inconsistent? Why are the Write speeds still below what botts suggests are a range from 25-40 MB/sec? I understand I don’t have jumbo frames on (as they never seem to work), but even so, it should be better.
On the laptop the peak speeds are in the range bott describes, but the Read speeds are wildly volatile and drop well below the expected range.
I’ve invested huge amount of time on my NV over 5 years, and I’ve always had slow speeds. Having upgraded the Desktop NIC card, I assumed that would improve, but there really seems to be a problem separate from the Actiontec Router. I am pretty exhausted from all this. I know my family is.
Off to the Superbowl now....
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