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#1
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
Hello,
I am testing Pentium III 450 mhz overclocked to 600 mhz- AMD X2 3800+ Windows 32 bit - Windows 64 bit. The Dream PC only achieves 2.7 MB/sec when it tries to send via the NVIDIA nForce Networking Controller. I haven't tested the other integrated network chip yet. This performance seems quite poor since even the PIII 600 mhz is able to achieve 5 MB/sec or so to the AMD... with a special pci gigabit networking card. The question is what is causing this bottleneck ? First I thought it could be my own software... I modified it a bit... but I no longer think it's my software... ofcourse it could still be a problem with my software so maybe I should test with other software as well... but suppose I am correct and it's not the problem with my software what else could the problem be ? I can think of many possibilities: 1. Slow integrated network chip. 2. Windows XP 64 bit networking stack bottleneck. 3. Bad network card settings. 4. Bad windows settings/limitations/flow control (?). 5. Maybe wrong cable ? I don't think so it's a cat 0.6 cable. The card in the PIII 450 mhz is a 3COM 3C2000-T card. Actually the PIII computer is a very crappy computer... the pci card could jump out any moment... it doesn't completely fit properly... but still... it seems to work ok... The problem seems to be with the Dream PC's hardware or software or settings. Has anybody else noticed poor networking performance with this software or hardware ??? Any idea',suggestions/comments what the problem might be.. or any tips are welcome... ?!?!?! Bye, Skybuck. |
#2
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
I forgot to mention one important observation:
If the packet size/payload size is only around 548 bytes the performance is poor: * only 2.7 MB/sec from AMD x2 3800+/xp 64 bit to PIII 600 mhz/xp 32 bit. * only 2.8 MB/sec from PIII 600 mhz/xp 32 bit to AMD x2 3800+/xp 64 bit. However the PIII shows it can send at 8.5 MB/sec at this packet size. So the AMD computer seems to be the bottleneck. ??? If the packet size/payload size is large for example arround 50000 bytes the performance is quite good: * 15 MB/sec from AMD x2 3800+/xp 64 bit to PIII 600 mhz/xp 32 bit * 20 MB/sec from PIII 600 mhz/xp 32 bit to AMD x2 3800+/xp 64 bit Bye, Skybuck. |
#3
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
I also tried changing some network card/chip settings... no effect.
When sending and receiving at the same time the throughput even halfs to 1.35 MB/sec on the AMD/64 bit xp... Not good. Bye, Skybuck. |
#4
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
Skybuck wrote: Hello, I am testing Pentium III 450 mhz overclocked to 600 mhz- AMD X2 3800+ Windows 32 bit - Windows 64 bit. The Dream PC only achieves 2.7 MB/sec when it tries to send via the NVIDIA nForce Networking Controller. I haven't tested the other integrated network chip yet. This performance seems quite poor since even the PIII 600 mhz is able to achieve 5 MB/sec or so to the AMD... with a special pci gigabit networking card. The question is what is causing this bottleneck ? First I thought it could be my own software... I modified it a bit... but I no longer think it's my software... ofcourse it could still be a problem with my software so maybe I should test with other software as well... but suppose I am correct and it's not the problem with my software what else could the problem be ? I can think of many possibilities: 1. Slow integrated network chip. 2. Windows XP 64 bit networking stack bottleneck. 3. Bad network card settings. 4. Bad windows settings/limitations/flow control (?). 5. Maybe wrong cable ? I don't think so it's a cat 0.6 cable. The card in the PIII 450 mhz is a 3COM 3C2000-T card. Actually the PIII computer is a very crappy computer... the pci card could jump out any moment... it doesn't completely fit properly... but still... it seems to work ok... The problem seems to be with the Dream PC's hardware or software or settings. Has anybody else noticed poor networking performance with this software or hardware ??? Any idea',suggestions/comments what the problem might be.. or any tips are welcome... ?!?!?! How are the two PCs connected? If you've got a switch, does it indicate a 1000Mb/s link? What about the Windows status display for the network connection? Also, what's the CPU load on each box when you're running this test? If either box is hitting 100% (or getting close), that's going to be a limit (and a better NIC and/or driver can help there). If you're using a direct connection, note that this is not 100% reliable for GigE, and that you need to use a straight-through cable and *not* a cross over cable like you did for 10/100Mb Ethernet. If you use a crossover cable you'll at best negotiate back to 100Mb mode. |
#5
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
Have you tested entirely using just this pair of computers ? If I were
you, I'd do some tests with more PCs. What you see as the AMD PC being unable to send faster might very well be just the PIII receiving slower and buffers getting saturated. I have an AMD 3800+ X2 like yours, running win2k3 x64, and I'm pretty sure I've hit better speeds than yours...on the internet! |
#6
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
"Skybuck" wrote:
I forgot to mention one important observation: If the packet size/payload size is only around 548 bytes the performance is poor: * only 2.7 MB/sec from AMD x2 3800+/xp 64 bit to PIII 600 mhz/xp 32 bit. * only 2.8 MB/sec from PIII 600 mhz/xp 32 bit to AMD x2 3800+/xp 64 bit. However the PIII shows it can send at 8.5 MB/sec at this packet size. So the AMD computer seems to be the bottleneck. ??? If the packet size/payload size is large for example arround 50000 bytes the performance is quite good: * 15 MB/sec from AMD x2 3800+/xp 64 bit to PIII 600 mhz/xp 32 bit * 20 MB/sec from PIII 600 mhz/xp 32 bit to AMD x2 3800+/xp 64 bit You expect performance to go down if packet size or window size goes down. You encounter different limits in a communications session. Raw bit rate of the medium is just one. Another is frame rate limit of the hosts. Another is window size, in case ACK frames are used in the protocol. Search under Nagle Algorithm (RFC 896) for an interesting discussion on the latter consideration. Bert |
#7
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
I have isolated the problem I think.
The following service is necessary for better performance: "ForceWare Intelligent Application Manager (IAM)" When this service is running the UDP throughput increases too: 20 MB/sec. (AMD X2 3800+ to PIII 600 mhz ) (payload size 548 bytes) 6.8 MB/sec (PIII 600 mhz to AMD X2 3800+) (payload size 548 bytes) 32 MB/sec. (AMD X2 3800+ to PIII 600 mhz ) (payload size 32000 bytes) 21 MB/sec (PIII 600 mhz to AMD X2 3800+) (payload size 50000 bytes) That's much better ! =D I have the following services disabled because I don't think they are necessary and especially the apache service seems a bit dangerous: "ForceWare IP Service" "ForceWare user log service" "ForceWare Web Interface" (Apache!! - dangerous !) Bye, Skybuck. |
#8
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
Thanks for the response... I think I have solved all or part of the
problem... see my other posts What is the maximum throughput you have seen at lan ? Bye, Skybuck |
#9
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
Hello,
Thank you too for the quick response too. I think I have already solved the problem... See my other thread about the solution involving a necessary NForceWare service for better throughput... kinda strange huh ? I will answer your questions just for kicks and some more info They are connected via a patch through cable... so not a cross over cable So there is no switch... The status is 1 gigabit connection. AMD CPU load is 7 procent when receiving 20 MByte/sec from PIII. (Payload size 32000 bytes) PIII CPU load is 100 procent when sending 20 MByte/sec to AMD. (Payload size 32000 bytes) AMD CPU load is 30 procent when sending 33 MByte/sec from PIII. (Payload size 32000 bytes) PIII CPU load is 100 procent when receiving 33 MByte/sec from AMD. (Payload size 32000 bytes) One further note/observation is that when the AMD tries to send 40 MByte/sec and the throughput is only 33 MByte/sec the AMD CPU load is only 20%. That's kinda funny... so when it's sending too much the CPU load is actually lower... kinda strange... but probably some kind of software thingy... no biggie. So far I think I can be quiet happy with this performance. The PIII performance is still a bit low when the packet/payload size is around 548 bytes... Only 6.8 MB/sec or so. Still these speeds are much better than the crappy 2.7 MB/sec... Some day I'll also test the speed of both integrated network controllers on the AMD... I'll simply loop the cable around and connect them both hehe. But for now I need the internet connection... so I am not going to do that right now. Though just out of curiosity... what is the fastest throughput you have seen on a LAN/Gigabit connection ? Bye, Skybuck. |
#10
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Only 2.7 MB/sec over gigabit connection in Windows XP 64 bit ? (Skybuck's Dream PC 2006)
I haven't tested much on gigabit lans...with multiple simultaneous
connections I've maxed out 100mbits. |
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