On Sat, Mar 30, 2013 at 8:26 PM, Matt Joyce <mjo...@mttjocy.co.uk> wrote:
> Wow, 35:1 async I have to ask here is there anything using the upload at
> all during these tests especially calls in the higher priority class?
>
> The reason I ask is am thinking along the lines that if the download is
> 1500byte packets acks for each probably 60bytes or so is about 25:1
> unless sack is enabled on both ends, have you ever got 35Mbit download
> on that line?
>
Yes, just look at my charts. I'm getting peaks at 55 down. But I don't
have the upload charts working yet.
http://108.162.170.186/speedtest/
> Try watching your system monitor or bmon or some similar tool I'd be
> interested to know if your upload is maxing out, TCP downloads are not a
> one way process so it's quite possible to be looking for the wrong
> problem in the wrong place when the upload is the actual issue.
>
I don't think it is this because the problem is perfectly reproducible as
follows.
I turn on TC_ENABLE=Internal in shorewall and my downloads are 500Kbit or
so.
I turn it off and I get 20 to 30Mbit easily reproducible just about every
time.
> It might be worth confirming you have sack enabled on your end, I think
> it's normally a default but it can't hurt to make sure
> sudo sysctl -w net.ipv4.tcp_sack=1
>
Looks like it is already enabled
root@userver:~# sysctl -a | grep -i sack
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_sack = 1
Also have you tried checking with other servers?
>
This one is provided by my ISP so it is the shortest point for me. It is
the most logical one to check and any other one will be outside of their
network. Plus see my comment above about turning on and off tc.
> I'll avoid the whole topic of why ISP's think ratios of 35:1 or worse
> when an ISP tried to sell me one at 80M/2M suffice to say I was
> unimpressed and took their competitors 80M/20M product instead.
>
Yeah it peeves me too. Though they are coming out next month with
something like 25:5 for a better price so I'm going to switch.
--
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- Michael Pollan, author of "In Defense of Food"
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