Re: Fixing USB HDD Xfer @ 6MB/s (10 times slower than USB2)
- Gordo @ kurobox.com has recompiled the kernel using a loader.o
module that loads a newly compiled usb driver without the printk
call. This increases the speed about 10%.
--- In LinkStation_General@yahoogroups.com, "James Stewart"
> On the PPC processor based units, they left some very high overheadattempted
> debug statements compiled into the USB driver. Maybe they did with
> the MIPS based units as well. To fix it you have to recompile and
> reinstall the kernel. There are only a few people who have
> this over on www.kurobox.com with about half the people havingsuccess
> and the other half destroying their Kuroboxes. There may be somemore
> recent developments however, I'm a little out-of-date on thestatus of
> --- In LinkStation_General@yahoogroups.com, "Frenchy "
> <glasseron@y...> wrote:
> > Do we have a solution to fix the extra slow USB transfers to
> > external HDD's?
> > If you plug your USB2 disk on the front usb port, it should get
> > mounted as /dev/sda
> > Type:
> > /sbin/hdparm -t /dev/sda
> > Answer...:
> > Timing buffered disk reads: 64 MB in 10.08 seconds = 6.35
> > This may have something to do with the USB device driver or
> > fonctionality. USB in LS is still new to me.because
> > There is not much that hdparm V3.9 can probe about USB disks
> > they are connected as SCSI. Hdparm can not use IDE signalingaccross
> > a USB connection to access disk registers ..:The
> > hdparm -I /dev/sda
> > operation not supported on SCSI disks
> > If we do the math, 6MB/s = 48Mb/s ie 10 times less than USB2.
> > interface must not be setup correctly and makes the LS USB2the
> > interface sub-standard. The disk itself puts out about 30MB/s so
> > bottle neck is with the interface.the
> > As a lead, I can only guess that if the USB driver is polling
> > USB chip instead of using IRQ we'll get this range ofperformance.
> > Like I say I don't know a thing about USB implementation on LS!