Information request and tuning question

[Nqwsqw]

Hi,
I want to know how works autotuninglevel ?
Then, is dca and netdma enabled decrease network performance ?
And RWIN should be BDP(Rwin = ping x dl(kbps) / 8 / MSS et result round x MSS) or RWIN provided by Tcp Analyser ?

[Philip]

Autotuninglevel is determined by the OS depending on line conditions.
RWIN can't be directly set in newest Windows versions, so even though the Analyzer method is most efficient it is a moot point for Windows 8/10.
The effect of most of those settings are explained in the TCP Optimizer documentation, and in our tweaking articles on the main site:

https://www.speedguide.net/articles/tcp ... -2012-5821
https://www.speedguide.net/articles/win ... weaks-5077

[Nqwsqw]

So, what rwin should I use ?

« SpeedGuide.net TCP Analyzer Results »
Tested on: 2019.02.19 10:05
IP address: 86.234.xxx.xxx
Client OS/browser: Windows 10 (Chrome 72.0.3626.109)

TCP options string: 020405b40103030801010402
MSS: 1460
MTU: 1500
TCP Window: 262656 (not multiple of MSS)
RWIN Scaling: 8 bits (2^8=256)
Unscaled RWIN : 1026
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 10506kbps (1313KBytes/s)
BDP limit (500ms): 4202kbps (525KBytes/s)
MTU Discovery: ON
TTL: 111
Timestamps: OFF
SACKs: ON
IP ToS: 01001000 (72)
Precedence: 010 (immediate)
Delay: 0 (normal delay)
Throughput: 1 (high throughput)
Reliability: 0 (normal reliability)
Cost: 0 (normal cost)
Check bit: 0 (correct)
DSCP (DiffServ): AF21 010010 (18) - Assured Forwarding class 2, low drop precedence (RFC 2597).

[Philip]

Autotuninglevel - Normal

You can't set RWIN directly under Windows 10. For OSes that you can, one of the Analyzer recommended settings is most efficient.