Read Speed 3 x Slower than Write!!?

I think the 4/5 MB -> 2 MB drop off is due to buffering. The real speed is the later, sustained one.

How fast is your broadband connection? If it is > 20 mbits downlink, you could try testing the read/downlink speed using the internet. Similarly for uplink.

Beat me to it on the internet downlink suggestion :-). Compare wired vs wireless. Speedtest.net is good if you can't find another consistent server to use.

And turn off any antivirus on the PC. Incoming packets get inspected...

steve

A fast file server would be better than speedtest, but we should take what we can get...

Turning off antivirus makes sense, I had assumed it wasn't in the way since the wired speeds are symmetric. Though 7 MB/s is a bit pokey there too, I'd expect 8-9 on wired 100 mbit ethernet.

wired read = 7.5 MB/s
wired write = 7.5MB/s

wireless read = 2MB/s (this Is the problem)
wireless write = 5MB/s

remote connection over internet read = 1.5 MB/s
remote connection over internet read = 0.5 MB/s


tried turning off antivirus and firewall - no change

anynamewilldo85 wrote:
remote connection over internet read = 1.5 MB/s remote connection over internet read = 0.5 MB/s

I'm thinking this last one would be write????
That would be 12 mbs downlink, 512 kbs uplink service - not fast enough to help isolate this problem.

sorry yes last one should be write

Any other WiFi gadgets?

bwm is available via apt for checking bandwidth. But in all reality, the weak link is the 100Mb ethernet.

If you're using Windows you could use some TCP tweaks to make the window bigger, that might help.

I would speedtest from wlan, from fixed lan and connected directly to router. Then maybe you can see the bottleneck. Also depends whether the 100Mb is full duplex or not.

OP's issue is on the wifi link not the fast ethernet. He's getting approximately expected results on the fast ethernet (symmetric 7.5 MB/s goodput). I'd expect closer to 10, but I don't see how the wired link will create the asymmetric behavior on Wifi.

WiFi uplink speed is in line with typical 802.11n performance, but the downlink speed is only reaching 802.11g performance levels. He also has a 1500 byte MTU end to end, so there isn't any packet fragmentation. I think he's already done the speed tests you are talking about, though I am not sure what you mean by "directly connected to router". Did you mean "direct connect PC to NAS"?

I am also not seeing much reason to try and tweak TCP. Usually that is only helpful if the network path has a very large bandwidth-delay product, there's no evidence that he has that (and it seems unlikely given his equipment). If you don't know what you are doing there, you are likely to do more harm than good.

anynamewilldo85 - are you using the default windows settings, or did you tweak them (either on your own, or with a TCP optimizer program)?
Also, do you have any 802.11b or 802.11g devices connected to the router? A smartphone, or a wireless printer, for example?

If he had another PC or network storage device on either the LAN or the WiFi network, he could possibly do some more isolation. W/o that, I am not seeing any obvious way to do any further diagnosis. One could throw some equipment at it (a gigabit switch combined with a faster 802.11 access point). Though if the router is throttling back WiFi xmit for some reason (due to the "good neighbour policies") it might not help.

HI

Not touched windows settings
Occasionally will have a phone connected to wifi - however all tests have been carried out with the phone's wifi turned off