whenever i plug in a USB2.0-enabled storage device (in my case recently a 1GB Creative Muvo TX SE), the kernel recognizes it as USB-2.0 device, the ehci_hcd module gets loaded, usbview and all other sources tell me that it is a 480MB/s device :
Speed: 480Mb/s (high)
USB Version: 2.00
But: I never even reach a transfer rate of 800kB/s (which would only be 1/600 of the maximum thinkable speed). Instead, it writes files with about 200 kB/s, until after a few seconds, the transfer rate collapses to 80kB/s, which is not only bad but ugly.
On the same machine, booted with an i386 2.6-kernel from CDROM (Knoppix 4.0.1), the device is only recognized as USB1.1 full speed device, but still transfers a lot faster than under debian/amd64.
I examined my loaded modules and wasn't able to make out any chipset-specific modules, only some i2c-nforce modules (lsmod output attached), are there any modules I have to load /unload to make it work or do You have any other suggestion?
Thanks,
Marcus Müller
Module Size Used by nls_iso8859_1 5568 1 nls_cp437 7296 1 vfat 13440 1 fat 51824 1 vfat sd_mod 17880 2 vmnet 30552 7 vmmon 181944 0 binfmt_misc 12176 1 thermal 15308 0 fan 5384 0 button 7840 0 processor 24600 1 thermal ac 5704 0 battery 10760 0 lp 12864 0 ipv6 252256 17 reiserfs 226352 3 dm_mod 53800 0 nvram 8392 0 i2c_dev 10720 0 msr 3976 0 nvidia 4856084 18 aes 27112 0 cryptoloop 4288 0 loop 15760 1 cryptoloop it87 24356 0 hwmon_vid 3008 1 it87 i2c_isa 5952 1 it87 ide_generic 1600 0 [permanent] usb_storage 80128 1 usbhid 34720 0 snd_intel8x0 34536 1 snd_ac97_codec 102012 1 snd_intel8x0 snd_ac97_bus 2880 1 snd_ac97_codec analog 10784 0 snd_pcm_oss 51296 0 snd_mixer_oss 17472 1 snd_pcm_oss psmouse 39308 0 i2c_nforce2 7808 0 serio_raw 7748 0 ide_cd 40224 1 cdrom 36280 1 ide_cd gameport 15824 1 analog snd_mpu401 9440 0 snd_mpu401_uart 7872 1 snd_mpu401 snd_pcm 89932 3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss i2c_core 23064 4 i2c_dev,it87,i2c_isa,i2c_nforce2 shpchp 45120 0 pci_hotplug 11716 1 shpchp forcedeth 23876 0 ehci_hcd 30344 0 ohci_hcd 19716 0 parport_pc 36592 1 parport 38860 2 lp,parport_pc snd_rawmidi 26400 1 snd_mpu401_uart snd_seq_device 9744 1 snd_rawmidi snd_timer 23944 1 snd_pcm snd_page_alloc 11344 2 snd_intel8x0,snd_pcm snd 57984 12 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_mpu401,snd_mpu401_uart,snd_pcm,snd_rawmidi,snd_seq_device,snd_timer soundcore 10720 1 snd pcspkr 3784 0 floppy 65664 0 ext3 128272 4 jbd 54184 1 ext3 mbcache 9352 1 ext3 ide_disk 16256 9 sata_nv 10628 0 libata 60760 1 sata_nv scsi_mod 144856 3 sd_mod,usb_storage,libata amd74xx 15280 0 [permanent] generic 5636 0 [permanent] ide_core 139160 6 ide_generic,usb_storage,ide_cd,ide_disk,amd74xx,generic evdev 10944 0