Check the dirty ration while USB transfer. It might getting change.. On Fri, Sep 28, 2012 at 7:19 PM, m-ric <emeric.vig...@gmail.com> wrote:
> Good to know someone shares the problem. I posted on pretty much all the > mailng list I know, without any "me too" effect. > I have not fixed this issue yet. I know it is related to USB host driver > (ehci-omap.c) because USB mass storage - panda being the host, usb stick > being the device - also has transfer issue (Write). An interrupt is not > fired properly in TX, RX is fine. I will resume my investigation not > before the end of october. > > Post in here if you make any progress in the meantime. > > Thanks, > Emeric > > > On Friday, September 28, 2012 4:19:22 AM UTC-4, Sagar Shinde wrote: >> >> Hi, >> We are facing the same issue. >> Did you get any solution for this? >> >> Thanks in advance. >> BR >> Sagar >> sangi.hs_gmail.com >> >> On Thursday, July 12, 2012 10:26:32 PM UTC+3, m-ric wrote: >>> >>> Hi, >>> >>> I run AOSP-4.0.4 on a pandaboard rev A3. I got linux kernel from >>> remotes/android-omap/android-**omap-panda-3.0 branch, 52f4764 commit >>> "Revert gpu: pvr: Revert to 1.8@550175". >>> >>> With this software: >>> 1. Ethernet bandwidth is very low, barely usable for file transfers. >>> TX gets stuck, I measured 20KBps. RX is quite slow too. >>> 2. USB storage on USB host port suffers same limitations. I measured >>> ~100KBps. >>> >>> Problem is known though, fedora- and ubuntu guys saw it: >>> http://article.gmane.org/**gmane.linux.redhat.fedora.arm/**1266<http://article.gmane.org/gmane.linux.redhat.fedora.arm/1266> >>> https://bugs.launchpad.net/**linux-linaro/+bug/709245<https://bugs.launchpad.net/linux-linaro/+bug/709245> >>> >>> My kernel embeds Ming Lei's barrier patch in ehci-q.c: >>> usb: ehci: make HC see up-to-date qh/qtd descriptor ASAP >>> and Will Deacon's ARM errata CONFIG_PL310_ERRATA_769419: >>> ARM: 7161/1: errata: no automatic store buffer drain >>> I checked that asm on this latter commit is fine (dsb instr.). >>> >>> Still above bugs are still present. For fedora and ubuntu guys though, >>> above fixes have solved the problem. >>> I am reluctant to change my (entire) kernel because everything else >>> that I need works fine. I am in a maturation phase, not in a >>> development phase anymore. >>> >>> Does anyone experience that on pandaboard and aosp? >>> Did you find any workaround? >>> >>> I have been on this bug for 4 weeks now. I am kind of desperate right >>> now. >> >> -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel > -- Regards, satish patel -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
