Read Speed 3 x Slower than Write!!?

iv just fired up my old netbook to do some additional testing

ok from netbook (OLD SAMSUNG NC10) over wlan im getting 1.5MB/s read 1.7 MB/s write

anynamewilldo85 wrote:
ok from netbook (OLD SAMSUNG NC10) over wlan im getting 1.5MB/s read 1.7 MB/s write

Ok. That is probably using 802.11g (hence the slow speeds in both directions). Symmetric, but not really the goal...

Try sharing a folder on the netbook, and connecting it wired. Then transfer files to it from the new laptop (connecting the new one with WiFi). That takes the NAS out of the equation.

ok netbook wired to router , laptop connecting wirelessly via homegroup sharing

im getting between 2.8MB/s both ways

Ok. It appears that the netbook is slower than the NAS, otherwise the write speed at least would match.

This result suggests that you should be getting faster read speeds from the NAS anyway - since your network can carry it. Though it isn't obvious to me why that the speed is dropping that way.

Try netstat -e from your windows command line before and after a NAS read test. Are you seeing errors and discards go up?

Also, on the new laptop - is the wifi network classified as home (network and sharing center)? Do you have Readynas Remote installed?

Before and after....


Received Sent

Bytes 632069928 33443019
Unicast packets 473964 278916
Non-unicast packets 180 24740
Discards 0 0
Errors 0 172
Unknown protocols 0

C:\Users\xxx>netstat -e
Interface Statistics

Received Sent

Bytes 1007936598 41851107
Unicast packets 727368 413892
Non-unicast packets 186 25904
Discards 0 0
Errors 0 172
Unknown protocols 0


=========================================================

Home network - yes
Readynas remote installed - yes

Ok. No errors seen by netstat, though it won't see wifi retransmits, etc.

Maybe try uninstalling Readynas Remote.

ok just uninstalled - no difference though

ok. That was a bit of a long shot, since if the data were going through ReadyNAS remote servers, I'd expect 500 kb/sec speeds (e.g, your internet uplink).

So to recap what we know: no firewall, no antivirus/security suite running, no readynas remote, and a significant reduction in wifi downlink speed. The problem is apparently not there when accessing the old netbook, and isn't there when accessing the NAS over fast ethernet.

I am stumped on the cause.

You could try using ftp instead of cifs (enabling it on the NAS and installing filezilla on the laptop). That would give us some information on whether the file protocol matters (linux samba doesn't work exactly the same way as windows file sharing), and potentially provide a workaround. It's easy to try, but likely won't help solve the real problem.

Anyone else have ideas on what to try?

same speeds using ftp. write 5MB/s read 2MB/s