2009/5/22 Andrey Yurovsky <andrey@xxxxxxxxxxx>: >> On Thu, 21 May 2009 16:11:17 -0700, Andrey Yurovsky <andrey@xxxxxxxxxxx> >> wrote: >>> On Thu, May 21, 2009 at 3:38 PM, Dan Williams <dcbw@xxxxxxxxxx> wrote: >>>> On Thu, 2009-05-21 at 08:00 +0800, Dongas wrote: >>>>> 2009/5/21 Dan Williams <dcbw@xxxxxxxxxx>: >>>>> > On Wed, 2009-05-20 at 22:48 +0800, Dongas wrote: >>>>> >> 2009/5/20 John W. Linville <linville@xxxxxxxxxxxxx>: >>>>> >> > On Wed, May 20, 2009 at 01:48:32AM +0800, Dongas wrote: >>>>> >> > >>>>> >> >> Why the bandwidth is not changed when bit rate is changed to >>> 11Mb/s? >>>>> >> >> Any thing wrong? >>>>> >> > >>>>> >> > More errors at higher bit rate, resulting in more retries? Just >>> a >>>>> >> > thought... >>>>> >> > >>>>> >> Is there a quick way to verify this possible reason? I'm using >>> Libertas driver. >>>>> >> >>>>> >> BTW, my sdio host driver is using polling mode to handle SDIO IRQ. >>>>> >> Could this be the cause of such poor performance? >>>>> > >>>>> > Definitely. With libertas, the largest class of issues by *far* >>> that >>>>> > we've seen are controller related. I seem to recall that I've >>> pulled >>>>> > about 6Mbps through the card using a normal Ricoh controller from a >>>>> > Fujitsu laptop. I can recheck that. >>>>> >>>>> AFAIK, most old laptop ,including my x61, doesn't support SDIO in HW. >>>>> So did Ricoh controller you tested use polling mode to handle SDIO IRQ? >>>>> Which clock of controller and which bit rate did you test? >>>> >>>> Actually, most of the older machines *can* do SDIO, those made from >>>> about 2006 - 2009. These days a lot of the SD "controllers" are >>>> actually USB-based mass-storage converters and cannot do SDIO, they are >>>> essentially 10-in-1 cardreaders. >>>> >>>> What is the 'lspci' output for your Thinkpad? If the controller isn't >>>> in 'lspci' but is in 'lsusb', then it's quite unlikely to work because >>>> of the above reason, I think. >>> >>> Right, you need a real SDIO (vs. SD storage) controller on the PCI >>> bus. However I can confirm that the ThinkPad X61 (and T61) controller >>> does full SDIO and you can plug Libertas SDIO cards into it. The >>> older X-series ThinkPads (I tried the X40 and X41) work great too. >> >> Great, since the os running on x61 is windows vista, i just run linux in >> vmware. >> So do you know whether the windows driver for x61 supports full SDIO >> well(including SDIO interrupt in HW)? > > Oh. Well, you need to run Linux right on the hardware (ie: not in > VMWare or any visualization software) for SDIO to work. I don't know > anything about Windows. I can confirm, from personal experience, that > the X61's SDIO works fine for Libertas in Linux. OK.Thanks for your info. BTW, do you know whether the X61's SD/SDIO controller supports SDIO IRQ in HW? Or it just works on polling mode for SDIO IRQ? Regards Dongas -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
