Sneha,
I am no longer using the beta kernel. BUT - I just moved to a
different platform with a fresh filesystem/kernel and ran the script
that was published in the document that you referenced and I have a
calculated write speed of 3.9MBytes/sec ! Much better. That's not too
different than my laptop.
I think that the problem is that I used `cp` to move a large file from
an SD card to the USB. When I think about this it's not a fair test
because of all the data movement going on in the system. Streaming video
to a USB thumb drive (which is the intention) is not a copy operation.
Thanks,
Steve
Narnakaje, Snehaprabha wrote:
> Steve,
>
> Were you trying to patch the Beta kernel with patches from "patch level 14
> release"? You may have missed the LSP 1.20 GA release. The patches from
> "Patch level 14 release" cleanly apply to the LSP 1.20 GA kernel. The default
> series file picks patches 1, 9 - 14. The patches 2 - 8 are for the custom
> MMC/SD stack.
>
> LSP 1.20, with patch level 14, we have reported the following -
>
> USB MSC Host Read: 6.4 MBytes/sec
> USB MSC Host Write: 6.3 MBytes/sec
>
> The procedure followed to measure the performance is documented in the
> datasheet - http://focus.ti.com/lit/an/sprs496a/sprs496a.pdf
>
> BTW, we also have a LSP 2.00 Beta release, which is based on MV Pro 5.0.0
> (2.6.18) on the software update advisor site. USB MSC Host performance has
> improved with this release:
>
> USB MSC Host Read: 13.4 MBytes/sec
> USB MSC Host Write: 7.3 MBytes/sec
>
> Thanks
> Sneha
> ________________________________________
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stephen Berry
> Sent: Tuesday, November 11, 2008 4:14 PM
> To: [email protected]; Subbrathnam, Swaminathan
> Subject: USB patches (patch level 14) for LSP 1_20
>
>
> I'm running into a performance issue with using USB memory sticks - namely
> very low write performance. I've recently ported to LSP 1_20 (from the beta)
> and after searching the mailing list there seemed to be some mention of a
> patch level 45 on the 6446 that would fix this issue...
>
> But of course for the Dm355 distribution on the Ti update site, patch level
> 14 is the current one. And to top it off, they don't apply cleanly with quilt.
>
> So before I go through each patch individually I'd like to make sure that
> these patches will help with my problem. Most of the comments seem to be
> relating to OTG functionality - but the patch labeled
> lsp_1_20_usb_intr_schedule_fix_014.patch - sounds like it could be helpful.
>
> Any help is appreciated,
>
> Steve
>
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