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Read Speed 3 x Slower than Write!!?
Hi I have recently purchased a ready Nas duo v2 ( 2 x 3tb Seagate barracuda drives - flexraid 0) Im seeing horrific read performance of around 1.5 MB/s where as write speed is around 4.5 MB/s ...
Increase TCP window size.
AFAIK (many moons ago) the receiver determines the window size. So 5MB/s is close given a 100Mbps fixed link and increased latency from the wireless. You say you card is 300Mbps, but is your router (you don't specify model)? If not and is only g 5MB/s is great. I would guess that the PC is either not negotiating properly or has a small defined window size and is not scaling properly.
So you could:
- reset the IP stack
- increase the default window size (in many OSes it still defaults to 64K which is far too small)
- lower the wireless speed if it is trying @ 300 and getting errors
If that doesn't help, check the write speed to HDD (or read/copy files to a RAM drive). If all that fails... try different network card.
If you're paying sky money for TV each month call them and ask for a better router (for free of course).
HTH.
AFAIK (many moons ago) the receiver determines the window size. So 5MB/s is close given a 100Mbps fixed link and increased latency from the wireless. You say you card is 300Mbps, but is your router (you don't specify model)? If not and is only g 5MB/s is great. I would guess that the PC is either not negotiating properly or has a small defined window size and is not scaling properly.
So you could:
- reset the IP stack
- increase the default window size (in many OSes it still defaults to 64K which is far too small)
- lower the wireless speed if it is trying @ 300 and getting errors
If that doesn't help, check the write speed to HDD (or read/copy files to a RAM drive). If all that fails... try different network card.
If you're paying sky money for TV each month call them and ask for a better router (for free of course).
HTH.
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