Re: OMAP3 EHCI USB HS mode performance issue

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Hi Ajay,

I have tested with USB hard disk and getting ~264 Mbps.  Is there any option/method to increase the performance?

with regards
Ganeshan 



----- Original Message ----
From: Ganeshan N <nganeshan1@xxxxxxxxx>
To: "Gupta, Ajay Kumar" <ajay.gupta@xxxxxx>; "linux-omap@xxxxxxxxxxxxxxx" <linux-omap@xxxxxxxxxxxxxxx>
Sent: Wednesday, February 4, 2009 11:34:14 AM
Subject: Re: OMAP3 EHCI USB HS mode performance issue

Hi Ajay,
Thanks a lot for your valuable inputs.   I will keep you posted with my observations on this after testing with USB hard disk.

Thanks & Regards
Ganeshan



----- Original Message ----
From: "Gupta, Ajay Kumar" <ajay.gupta@xxxxxx>
To: Ganeshan N <nganeshan1@xxxxxxxxx>; "linux-omap@xxxxxxxxxxxxxxx" <linux-omap@xxxxxxxxxxxxxxx>
Sent: Wednesday, February 4, 2009 11:13:36 AM
Subject: RE: OMAP3 EHCI USB HS mode performance issue

> I am transfering 100MB file to pen drive.  I have tried with pen drive with different manufacturer
> (Tanscend, SanDisk, Kingston).  I am using OMAP35x EVM.

We have observed lower throughput with pen drive so it's better if you take the performance numbers
from any USB hard disk. 

I think you are using OMAP35x EVM with Mistral daughter card. With Mistral DC, I am getting a read/write throughput of ~160Mbps on EHCI with USB HDD and CPUIDLE=off.

Regards,
Ajay

> 
> Thanks & Regards
> Ganeshan
> 
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