Re: SDHC Read Performance

2011-03-22 Thread Simon Horman
On Mon, Mar 21, 2011 at 11:55:36PM +0100, Arnd Bergmann wrote: On Monday 21 March 2011 23:38:56 Simon Horman wrote: Write Speed # dd if=/dev/zero of=/dev/mmcblk0 bs=512 count=10 SD1.1: 2.5 MB/s -- Faster than expected SD2.0: 3.0 MB/s -- Faster

Re: SDHC Read Performance

2011-03-21 Thread Arnd Bergmann
On Monday 21 March 2011 23:38:56 Simon Horman wrote: Write Speed # dd if=/dev/zero of=/dev/mmcblk0 bs=512 count=10 SD1.1: 2.5 MB/s -- Faster than expected SD2.0: 3.0 MB/s -- Faster than expected SDHC Class 2: 2.3 MB/s -- Faster than

Re: SDHC Read Performance

2011-01-20 Thread Magnus Damm
On Thu, Jan 20, 2011 at 4:07 PM, Simon Horman ho...@verge.net.au wrote: On Thu, Jan 20, 2011 at 01:01:04PM +0900, Magnus Damm wrote: 1) Can you try a different SDHC Class 10 card? I'd just simply buy a top-of-the-line SanDisk card myself and try that, but anything different from what you're

Re: SDHC Read Performance

2011-01-20 Thread Paul Mundt
On Thu, Jan 20, 2011 at 05:28:55PM +0900, Magnus Damm wrote: On Thu, Jan 20, 2011 at 4:07 PM, Simon Horman ho...@verge.net.au wrote: As we discussed (offline) yesterday, it ought to be possible to change the frequency of the clock source. And in the case of the mackerel this can probably be

Re: SDHC Read Performance

2011-01-20 Thread Magnus Damm
On Thu, Jan 20, 2011 at 5:38 PM, Paul Mundt let...@linux-sh.org wrote: On Thu, Jan 20, 2011 at 05:28:55PM +0900, Magnus Damm wrote: On Thu, Jan 20, 2011 at 4:07 PM, Simon Horman ho...@verge.net.au wrote: I imagine it would be possible to manipulate the frequency such that MMC can be run

Re: SDHC Read Performance

2011-01-19 Thread Simon Horman
On Wed, Jan 19, 2011 at 12:14:40PM +0900, Magnus Damm wrote: Hi Simon, On Wed, Jan 19, 2011 at 9:09 AM, Simon Horman ho...@verge.net.au wrote: Hi, I am currently interested in the read performance of the SDHI driver.  I ran the following tests on a Mackerel board using Linus's latest

Re: SDHC Read Performance

2011-01-19 Thread Simon Horman
On Wed, Jan 19, 2011 at 05:05:49PM +0900, Simon Horman wrote: On Wed, Jan 19, 2011 at 12:14:40PM +0900, Magnus Damm wrote: Hi Simon, On Wed, Jan 19, 2011 at 9:09 AM, Simon Horman ho...@verge.net.au wrote: Hi, I am currently interested in the read performance of the SDHI driver.  I

Re: SDHC Read Performance

2011-01-19 Thread Simon Horman
On Thu, Jan 20, 2011 at 01:01:04PM +0900, Magnus Damm wrote: 1) Can you try a different SDHC Class 10 card? I'd just simply buy a top-of-the-line SanDisk card myself and try that, but anything different from what you're having is probably useful as a contrast. Sure, will do. 2) How about the

SDHC Read Performance

2011-01-18 Thread Simon Horman
Hi, I am currently interested in the read performance of the SDHI driver. I ran the following tests on a Mackerel board using Linus's latest tree (6845a44a), which I believe has all of the outstanding patches from Arnd and Guennadi merged. I have made the following crude performance

Re: SDHC Read Performance

2011-01-18 Thread Magnus Damm
Hi Simon, On Wed, Jan 19, 2011 at 9:09 AM, Simon Horman ho...@verge.net.au wrote: Hi, I am currently interested in the read performance of the SDHI driver.  I ran the following tests on a Mackerel board using Linus's latest tree (6845a44a), which I believe has all of the outstanding patches