kelsey hudson wrote: > Gus Wirth wrote: >> If I do an NFS mount and copy a large file from the server to >> /dev/null on the client or if I scp a file between the server and >> client I get pretty much the same results, about 11MB (that's bytes) >> per second. This is only about 10% better than 100baseT ethernet. I >> know from previous experiments that my hard drives and general system >> throughput can handle about 25MB/sec. > > Many cheap gigabit switches aren't wirespeed. Also, beware the 32 bit, > 33MHz PCI woes. 32/33 PCI is only capable of 132MByte/sec at maximum. > Also keep in mind that other things are happening on PCI as you're doing > the transfer, namingly slamming the hard disks, etc. > >> So any hints on how to get this to work faster, or am I seeing the >> results of a marketing scam? > > Try a better switch. You may not need this many ports, but usually > things with 24+ ports are better than consumer grade and offer better > throughput. Also, try a better board, something with the intel E1000 > chipset or broadcom chipsets. also good is alteon acenic. > > to isolate the switch as a potential choke point, connect a garden > variety crossover (cat 6!) cable between the two machines and set IP > addresses manually, etc., then start the copy. see if performance > increases. also, make sure all your cables are cat6. cat5 wasn't meant > for gigabit speeds. cat5e may be able to handle them but I think it's > only rated to atm over copper speeds (155MBit/sec). so yeah. make sure > you use new cables. generally, the machine-built ones are better than > the hand-built ones, since the machine can align the wires better > without removing twists. > > if you ask me, there's only one way to do gigabit and get any proper > performance/reliability out of it: 1000Base-SX; that is, gigabit over > multimode fiber, and high-end equipment (boards and switches). at my > house i have a cisco 3550 switch which has two GBIC ports; connected to > these are SX GBICs -- one goes to my workstation which has one of the > aforementioned AceNICs, the other will uplink to a second switch someone > at work is giving me. >
Do you have any performance measurements on your home system? ..jim -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
