On Mon, 25 Apr 2005, Hendrik Muhs wrote: > this is the output of /proc/bus/usb/devices for pl-3507 with 250 GB Seagate: > > T: Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=480 MxCh= 0 > D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > P: Vendor=067b ProdID=3507 Rev= 1.00 > S: Manufacturer=Prolific Technology Inc. > S: Product=Mass Storage Device > C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=100mA > I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage > E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms > E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms > > > As you also said, that seems to be not the problem. Anyway, I should have > said > explicitly that the problem is only with writes. Reads are ok (with this > setup around 17-18MB/s). > > I measured the speed with Midnight Commander, simply by copying a big file > (700MB iso image) from the local hd to the external one. That is maybe not a > perfect benchmark, but it's ok here. > > The tests are only done one at a time, so no bus sharing. I do not have any > other USB devices (or FW devices) plugged in. > > The system is Debian Sarge in it's current state and a vanilla 2.6.11.7 > kernel. If I remember right I had this problem also with the Debian 2.6.8 > kernel. > > Maybe an interesting note: The external hd seems to make "abrupt noises", > when > I copy the data from local hd to the external hd. Copying from external to > local makes the normal "flush noise".
It looks like you're suffering from the "GO_SLOW" problem the PL-3507 has when running at high speed. This has been fixed in 2.6.12-rc3. Try running the latest kernel and see if it works any better. Alan Stern ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
