Vista Network Performance & Multimedia Playback

[tmjuju]

http://forums.2cpu.com/showthread.php?t=83112

 

Apistefto kai omos alh8ivo!

Av paizete mousikh 'h video (me opoiovdhpote player), ta vista kobouv thv taxitita tou diktiou!

 

To katagrafw kai edw giati eivai apo ta polu perierga "features" twv vista... kai exeis steilei pollous va psaxvovtai gia to ti sumbevei.

[21century]

Πραγματικα αυτο ειναι πολυ περιεργο και μαλλον θα μας διαφωτισει περισσοτερο το sp1 που θα ερθει ελπιζω συντομα...

[tmjuju]

lupame, alla dokimes me pre-SP1 dev fevete va luvouv to problhma.

 

Gevika mias kai pooly syxva avtigrafw apo Gbit Ethernet se central-storage, eivai megalo problhma va mhv mnporeis sygxrovos va akous mousikh.

[FarCry]

exete dokimasei kai stand alone players san ton KM player? ektos diladi windows media player, pou exoun ensomatomenous tous dikous tous codecs kai den xrisimopoioun tou sistimatos. afiste to directshow

 

parousiazetai to idio problima? gia peite

[tmjuju]

FarCry, ri3e mia matia sto 2cpu.com , kai me vlc to idio problhma uparxei. Gevika dev eivai 3eka8aro to poio vista-component eu8ivete gia to zhthma auto.

 

Skepsou va exeis parei kai kamia KillerNIC gia low-lat gaming kai low-cpu file transfers... kai va se sampotarouv ta vista

[tmjuju]

http://blogs.technet.com/markrussinovich/archive/2007/08/27/1833290.aspx

 

Apospasma:

Tests of MMCSS during Vista development showed that, even with thread-priority boosting, heavy network traffic can cause enough long-running DPCs to prevent playback threads from keeping up with their media streaming requirements, resulting in glitching. MMCSSʼ glitch-resistant mechanisms were therefore extended to include throttling of network activity. It does so by issuing a command to the NDIS device driver, which is the driver that gives packets received by network adapter drivers to the TCP/IP driver, that causes NDIS to “indicate”, or pass along, at most 10 packets per millisecond (10,000 packets per second).

 

Because the standard Ethernet frame size is about 1500 bytes, a limit of 10,000 packets per second equals a maximum throughput of roughly 15MB/s. 100Mb networks can handle at most 12MB/s, so if your system is on a 100Mb network, you typically wonʼt see any slowdown. However, if you have a 1Gb network infrastructure and both the sending system and your Vista receiving system have 1Gb network adapters, youʼll see throughput drop to roughly 15%.

 

Further, thereʼs an unfortunate bug in the NDIS throttling code that magnifies throttling if you have multiple NICs. If you have a system with both wireless and wired adapters, for instance, NDIS will process at most 8000 packets per second, and with three adapters it will process a maximum of 6000 packets per second. 6000 packets per second equals 9MB/s, a limit thatʼs visible even on 100Mb networks.

 

MA8evoume siga siga to ti fteei alla...

Dustyxos kaveva patch/solution akoma