Hi Enzeneer, No, it is different issue. The link you mentioned is related to SATA and SMP. I tried single CPU and nothing changes. It has not SATA either. So far I can only say that TX DMA is not triggered in this case. Moving USB mouse helps increasing TX data rate. Thanks for trying.
Chyifeng On Thursday, July 12, 2012 12:26:32 PM UTC-7, 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 > 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 --- You received this message because you are subscribed to the Google Groups "Android Linux Kernel Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-kernel+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
