Am Montag, 25. April 2005 20:19 schrieb Alan Stern: > 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.
I have tested 2.6.12-rc3 and it is not better. As I said in my previous mails the problem seems to be more generic. I also have problems with the oxford 922 chipset and firewire (maybe a problem with the SCSI subsystem or some mainboard chipset specific issue???). So, it seems that I have to try to find the kernel version, after it breaks. If I remember right it does not work with 2.6.8, so probably I will start with 2.6.7. So hopefully I can make a better error report on this. Hendrik Muhs > > Alan Stern ------------------------------------------------------- SF.Net email is sponsored by: Tell us your software development plans! Take this survey and enter to win a one-year sub to SourceForge.net Plus IDC's 2005 look-ahead and a copy of this survey Click here to start! http://www.idcswdc.com/cgi-bin/survey?id=105hix _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
