Hi Matthew, 2010/5/16 Matthew Grooms <[email protected]>
> On 5/16/2010 4:11 PM, [email protected] wrote: > >> Hi Matthew, >> >> 2010/5/16 Matthew Grooms <[email protected] <mailto:[email protected]>> >> >> >> >> A few more questions ... >> >> 1) What type of connection are you using ( local ethernet, internet >> dsl, cable, fiber )? >> >> > Ok. So the bulk of the traffic is NNTP ( TCP:119 ) traffic? Yes, exactly. Just a further note: When I'm downloading binary files from the usenet, i have configures NewsLeecher to use 50 connections to the server in parallel. > I have a VDSL line with 50 Mbps, and I have a router Telekom Speedport W >> 722V. My PC is connected to the router via devolo dLAN powerline. >> >> 2) What is the nature of your IP traffic during high utilization ( >> ftp http, torrent )? >> >> > Nice :) I wish I had a 50Mbps connection to my house. In any case, does > this involve some sort of PPP negotiation between your router and the telco > edge? Yes, I think so. > If so, that would lend credence to my theory that the issue is related to > our kernel mode IP fragment cache code. I'm setting up a test system for > this at the moment, but you can also try setting the soft MTU of your > workstations network adapter to 1400 bytes or so ... > > > HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\{AdapterID}\Tcpip\Parameters > > Name : MTU > Data Type: DWORD > > Set it to equal the required MTU size in decimal (default 1500) > > ... and disable/re-enable the adapter. This will cause TCP to use a MSS of > 1380 or so which should avoid any IP fragmentation. After your done testing, > you can just revert the MTU change. Hmm, there are a huge number of entries under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ and it's not so easy for me to find {AdapterID}. For the time being, I would like to avoid that test. However, if you are not able to find and fix the problem without me doing that test, let me know and I will try it. > Downloading binary files from the usenet by means of NewsLeecher. Usenet >> provider is Giganews. NOT using encrypted server connection (SSL). >> >> 3) Does the problem still occur if all Shrew Soft services are >> stopped in the computer management console? >> >> >> After stopping all three Shrew Soft services (but with the Shrew Soft >> Lightweight Filter still enabled), the problem still occurs. >> >> > Ok, definitely an issue isolated to the driver code. Thanks for testing. > > -Matthew > Best regards, Andreas
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