On 10/09/2014 07:07 PM, Mark Knibbs wrote:
[For removable media, it's a good idea to disable polling for medium
changes before running a test. Depending on kernel & distribution that could
be achieved by doing
udisks --inhibit-all-polling
and/or for example
echo -1 >/sys/block/sdb/even
On Thu, 9 Oct 2014, Mark Knibbs wrote:
> I finally finished doing git bisect between 2.6.33 and 2.6.34. Sadly I'm
> not really any the wiser, since the result looks pretty bogus.
>
> The supposedly-bad commit was:
> 002345925e6c45861f60db6f4fc6236713fd8847
> syslog: distinguish between /proc/
Hi,
On Thu, 09 Oct 2014 16:45:39 +0800
Lu Baolu wrote:
> I got a different result with my machine. Below is the details.
> ...
> >>> Connected to USB 2.0 port via USB 1.1 hub:
> ...
> allen@allen-ivb:~$ sudo ddpt if=/dev/sg2 bs=512 bpt=240 count=65536
> verbose=2
> ...
> time to read data: 30.
On Mon, 29 Sep 2014 09:28:37 -0400 (EDT)
Alan Stern wrote:
> On Sun, 28 Sep 2014, Mark Knibbs wrote:
>
> > > There's no telling the reason for this difference. It's got to be a
> > > hardware issue, though, not a software problem. Maybe your xHCI
> > > controller just isn't optimized for carry
Hi Mark,
I got a different result with my machine. Below is the details.
>>> Kernel version
allen@allen-ivb:~$ uname -a
Linux allen-ivb 3.17.0+ #1 SMP Thu Oct 9 16:19:28 CST 2014 x86_64 x86_64
x86_64 GNU/Linux
>>> Host controler information
allen@allen-ivb:~$ lspci | grep USB
00:14.0 USB co
On Tue, 30 Sep 2014 14:10:28 +0800
"Lu, Baolu" wrote:
> On 9/30/2014 5:03 AM, Mark Knibbs wrote:
> > Great. I hope someone else is motivated to reproduce the issue. It will
> > take a long time for me to bisect due to my slow computer.
> Hi Mark,
>
> I tried to reproduce this issue. I connected
On Tue, 30 Sep 2014 14:10:28 +0800
"Lu, Baolu" wrote:
> I tried to reproduce this issue. I connected a USB key under a
> full-speed hub.
>
> sg_rbuf returns error which I am not familiar with.
>
> allen@allen-ivb:~$ lsusb -t
> [...snip...]
> /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehc
On 9/30/2014 5:03 AM, Mark Knibbs wrote:
Great. I hope someone else is motivated to reproduce the issue. It will
take a long time for me to bisect due to my slow computer.
Hi Mark,
I tried to reproduce this issue. I connected a USB key under a
full-speed hub.
sg_rbuf returns error which I a
On Mon, 29 Sep 2014 09:28:37 -0400 (EDT)
Alan Stern wrote:
> On Sun, 28 Sep 2014, Mark Knibbs wrote:
>
> > > There's no telling the reason for this difference. It's got to be a
> > > hardware issue, though, not a software problem. Maybe your xHCI
> > > controller just isn't optimized for carry
On Sun, 28 Sep 2014, Mark Knibbs wrote:
> > There's no telling the reason for this difference. It's got to be a
> > hardware issue, though, not a software problem. Maybe your xHCI
> > controller just isn't optimized for carrying out full-speed transfers.
>
> That's a possibility, but the improv
On Thu, 25 Sep 2014 11:15:40 -0400 (EDT)
Alan Stern wrote:
> On Wed, 24 Sep 2014, Mark Knibbs wrote:
>
> > On Wed, 24 Sep 2014 11:37:11 -0400 (EDT)
> > Alan Stern wrote:
> >
> > > On Wed, 24 Sep 2014, Mark Knibbs wrote:
> > >
> > > > I did some benchmarks to check the maximum transfer rate of
On Wed, 24 Sep 2014, Mark Knibbs wrote:
> On Wed, 24 Sep 2014 11:37:11 -0400 (EDT)
> Alan Stern wrote:
>
> > On Wed, 24 Sep 2014, Mark Knibbs wrote:
> >
> > > I did some benchmarks to check the maximum transfer rate of a USB-to-SCSI
> > > converter. The converter is USB 1.1, so limited to the 1
On Wed, 24 Sep 2014 11:37:11 -0400 (EDT)
Alan Stern wrote:
> On Wed, 24 Sep 2014, Mark Knibbs wrote:
>
> > I did some benchmarks to check the maximum transfer rate of a USB-to-SCSI
> > converter. The converter is USB 1.1, so limited to the 12Mbps full speed
> > rate. The performance when connect
On Wed, 24 Sep 2014, Mark Knibbs wrote:
> Hi,
>
> I did some benchmarks to check the maximum transfer rate of a USB-to-SCSI
> converter. The converter is USB 1.1, so limited to the 12Mbps full speed
> rate. The performance when connected to a USB 3.0 port is significantly
> worse than when connec
Hi,
I did some benchmarks to check the maximum transfer rate of a USB-to-SCSI
converter. The converter is USB 1.1, so limited to the 12Mbps full speed
rate. The performance when connected to a USB 3.0 port is significantly
worse than when connected to a USB 2.0 port, about 26.5% slower (0.63MB/sec
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