tcp size?

[Guest]

Hi, I'm trying to set the TCP window size in XP/sp2 to optimise it, but got
some differing advice on what values to use. If someone could give me a
direction, I'd be grateful. 2MB broadband down at ~1760Mb/s.Thx..

 

[Larry(LJL269)]

I did tests 2 yrs ago on RR cable & found:
1. MTU < 1500 is a disaster
2. I plotted download speed versus RWIN & it seems to be maximized
for 27KB < RWIN < 33KB where you consistently get your best times.
However it is not symmetric: for every KB you decrease RWIN below 27KB
you lose twice as much speed as increasing it above 33KB
3. Speed at 5:00 PM is 1/3 slower than speed at 5:00 AM

http://www.dslreports.com/tweaks will calculate all 4 u

HTH-Larry

Hi, I'm trying to set the TCP window size in XP/sp2 to optimise it, but got
some differing advice on what values to use. If someone could give me a
direction, I'd be grateful. 2MB broadband down at ~1760Mb/s.Thx..

Any advice is my attempt to contribute more than I have received but I can only assure you that it works on my PC. GOOD LUCK.

 

[Larry(LJL269)]

I reviewed my settings & dramatically decreased wait time for videos
by lowering TTL from 128 to 64.

So tweak other settings too.

HTH-Larry

Hi, I'm trying to set the TCP window size in XP/sp2 to optimise it, but got
some differing advice on what values to use. If someone could give me a
direction, I'd be grateful. 2MB broadband down at ~1760Mb/s.Thx..

Any advice is my attempt to contribute more than I have received but I can only assure you that it works on my PC. GOOD LUCK.

 

[cornedbeef007-groups]

I reviewed my settings & dramatically decreased wait time for videos
by lowering TTL from 128 to 64.

TTL = Time To Live. It specifies the number of hops a packet is
allowed to take before being dropped.
The TTL is decremented every time it passes through a router. If it
reaches 0 then the packet is dropped, and the sender notified.
A lower TTL will make no difference to the download speed. It just
means if you hit circular routing, your packet will be dropped (a few
seconds) sooner, so you can send it again.

 

[Guest]

thanks guys ;

 

[Larry(LJL269)]

U r correct- it was coincidence.

Sice RRspeed 2MB->5Mb, I recalculated RWIN=48180(was ~34k) but Tweak
test result says RWIN between can be as high as 125560. So I think
I'll test 3 pts (48180, 125560, & average of these 2) & see what's
faster.

Thanks 4 input- bye- Larry

TTL = Time To Live. It specifies the number of hops a packet is
allowed to take before being dropped.
The TTL is decremented every time it passes through a router. If it
reaches 0 then the packet is dropped, and the sender notified.
A lower TTL will make no difference to the download speed. It just
means if you hit circular routing, your packet will be dropped (a few
seconds) sooner, so you can send it again.

Any advice is my attempt to contribute more than I have received but I can only assure you that it works on my PC. GOOD LUCK.