I did not disable DMA. I'm going to re-run the test on a different piece of hardware using a newer memory stick to see if that changes anything.
Subbrathnam, Swaminathan wrote: > Steve/BJ, > > I would like to re-confirm that USB is working with DMA enabled in your > configurations. > > The numbers that you have provided seems very very odd and we have never seen > such low numbers in our testing on the TI kernels. > > On the GIT kernel capabalities TI has been pushing most of the enhancements > to the GIT kernel through linux-omap GIT's. They should be available > starting from the next rc (I think) as they are a part of Greg KH's queue of > accepted patches. > > regards > swami > > > ________________________________________ > From: bj [EMAIL PROTECTED] > Sent: Thursday, November 13, 2008 1:57 AM > To: Stephen Berry > Cc: Subbrathnam, Swaminathan; [email protected] > Subject: Re: USB patches (patch level 14) for LSP 1_20 > > I'm also just using the MV kernel instead of the git for the same > reasons that Steve listed. > > I'm measuring write speeds in the order of 170KB/s. The VERY odd thing > is that I've previously measured speeds in the multiple MB/s ranges. > I'm seeing the exact same crippled write/read speeds in my SD writes as > well which leads me to believe something else is going on with the > system but I'm still very much interested on the progress of this patch. > > BJ > > Stephen Berry wrote: > >> Subbrathnam, Swaminathan wrote: >> >> Steve/BJ, >> >> Can you provide more details as to the issue you have reported. >> What is the throughput you are seeing and under what configuration. >> There was a new update that went out as I know of on DM355 that >> should roll in the patch45 changes on DM644x w.r.t USB. Probably it >> is yet to get posted to the external site. >> >> >> On the update site there is the release kernel with one patch (14). >> >> I only have rough write numbers - since that is what we care about most >> - approximately 600KB/sec. The same memory stick on my laptop does > >> 4MB/sec. >> >> I assume you are discussing the issue in the context of the DM355 >> GIT kernel. >> >> >> I'd love to port to the GIT kernel, but my understanding is that it's >> not ready for prime time yet (on the DM355). I've made quite a few >> changes to get my CMOS sensor and decoder working in the current Ti/MV >> kernel. >> >> If I'm wrong about the GIT kernel and it does everything that the MV >> kernel does - please let me know and I'll take a closer look. >> >> regards >> swami >> ------------------------------------------------------------------------ >> *From:* BJ Opp [EMAIL PROTECTED] >> *Sent:* Wednesday, November 12, 2008 3:37 AM >> *To:* Stephen Berry; [email protected]; >> Subbrathnam, Swaminathan >> *Subject:* RE: USB patches (patch level 14) for LSP 1_20 >> >> Steve, >> >> >> >> It seems you and I are chasing the same problems. I’m seeing pretty >> horrid write speeds on USB and was getting ready to try and chase >> down where they could be coming from so I second your question >> regarding the patches. Has anybody seen/fixed this issue? >> >> >> >> BJ >> >> >> >> ------------------------------------------------------------------------ >> >> *From:* [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] *On >> Behalf Of *Stephen Berry >> *Sent:* Tuesday, November 11, 2008 1:14 PM >> *To:* [email protected]; [EMAIL PROTECTED] >> *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 >> >> >> >> -- >> Integral Design and Development >> 312 Great Rd, Littleton MA 01460 >> voice: 978 501 7658 fax: 603-679-3988 >> >> This e-mail and any files transmitted with it are confidential and intended >> solely for the use of the individual or entity to which they are addressed. >> If you have received this e-mail in error please notify the originator >> immediately. The addressee is formally notified hereby that this e-mail and >> any attachments are to be treated as confidential. >> >> > >
_______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
