Swami, Lee,
I tested performance using 3 different USB devices (2 USB HDD and
1 USB Flash Disk).
Here is the performance test result.
Instructions for testing
----------------------------------
writing test:
time dd if=/dev/zero of=/mnt/test.gz bs=1M count=500 && sync
reading test:
time dd if=/mnt/test.gz of=/dev/null bs=1M && sync
Result:
Device Write Read
-----------------------------------------------------
USB HDD1 ~9.5MBps ~13.0MBps
USB HDD2 ~7.2MBps ~8.0MBps
USB FD ~3.8MBps ~9.0MB/s
It seems the performance is pretty good.
I made some minor changes and applied the patch to git 2.6.23, this
patch also works
well on git 2.6.23.
Regards
Frank
Ashuaria Lee wrote:
Hi Subbrathnam,
The only difference I feel is that I used a thumb USB Memory, which is
SanDisk cruzer micro 1.0GB, and you used USB HDD.
I can't understand Why? my read speed is so high, and why the write
speed so low.
I'll try the USB hdd when I get one.
Good Luck.
2008/5/31, Subbrathnam, Swaminathan <[EMAIL PROTECTED]>:
Lee,
On the TI DaVinci EVM I am consistently getting around 4-6MBps throughput
writing to the USB HDD's under DMA mode.
Many more MUSB fixes need to be done still compared to the 2.6.10 kernel MUSB
driver. I am planning to do the same gradually as seperate patches.
Any way I can reproduce your test setup ?
swami
________________________________________
From: Frank Xue [EMAIL PROTECTED]
Sent: Wednesday, May 28, 2008 8:24 AM
To: Ashuaria Lee
Cc: Subbrathnam, Swaminathan; davinci-linux-open-source
Subject: Re: USB CPPI DMA patch for DaVinci
Lee, Swami,
I did a simple and quick test. The kernel was also configured with
default setting.
It seems this patch fixed USB stability issue.
test case:
~ 20 files, about 100MBytes every file.
Speed benchmark result on git 2.6.25
---------------------------------------------
Read: 3.6M Bytes/sec
Write: 2.8M Bytes/sec
Lee, I almost could not believe the writing performance is so poor (
0.38MB/sec) on your board.
:(
Regards
Frank
Ashuaria Lee wrote:
> Hi,
>
> You patch DID work with the stability, and didn't crash using DMA mode.
> And Also I got more speed on reading data from USB-storage.
> The reading performance has increased significantly.
> But, the write speed has decreased.
>
> Let me add the screenshot of each results.
>
> The short summary is
> ============================================
> MVL 2.6.10 with patch 45 | GIT 2.6.25 with your DMA patch
> Read: 8.78MB/sec | 12MB/sec
> Write: 3.7MB/sec | 0.38MB/sec
> ============================================
>
> The GIT was configured with default setting and only changed to use DMA for
USB.
> did I do something wrong?
>
> Any opinions?
>
> Best Regards,
> Ashuaria Lee
>
>
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