Turl changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi
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<jlj> Oh well, I'm giving up for now. Thanks for all the help :)
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<paulk-collins> hey, come to think of it, we cannot use GPT with u-boot on sdcard, correct?
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<paulk-collins> GPT takes the first 34 sectors and u-boot-spl starts at sector 16 (assuming 512B/sector)
<NiteHawk> why would you use GPT on a sd card?
<paulk-collins> to have moar partitions!
<paulk-collins> and especially to make one for u-boot-spl, one for u-boot and one for u-boot-env
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<paulk-collins> damn this sucks
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<silentcreek> Hi. I've been playing around with the sunxi_defconfig of linux 4.0-rc6 a lot recently and I think I found a small mistake in it.
<silentcreek> It contains the symbol CONFIG_POWER_RESET_SUN6I=y
<silentcreek> But that symbol was removed from linux 4.0 (valid until 3.19)
<silentcreek> So, I guess that line should be dropped from the sunxi_defconfig as well.
<silentcreek> It's not a big deal since make will remove it anyway when the .config file is generated, but anyway.
<NiteHawk> silentcreek: i think you're right. i used merge_config.sh and got a warning about that one not ending up in .config, too
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<silentcreek> Ok, is any of the developers here to pick this one up to be fixed? Or should I report it to the mailing list? I'm not really a developer. But I guess formatting a patch to drop one single line wouldn't be that hard.
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<mripard_> silentcreek: please send a patch
<mripard_> you only learn how to contribute by actually doing it ;)
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<silentcreek> mripard_: Ok, I'll do so then.
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<silentcreek> Does anyone now about the performance impact of cpu schedulers on A20?
<silentcreek> I'm wondering about whether to enable CONFIG_SCHED_MC (multi core scheduler) and/or CONFIG_SCHED_SMT (multi threading scheduler).
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<silentcreek> Some people claim that enabling both has a positive impact on IO performance.
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<silentcreek> The first one kind of makes sense to me, but I'm skeptical about the latter.
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<silentcreek> I enabled CONFIG_SCHED_MC and I think it does really improve the performance of my device. The test scenario was to read large files from a samba share on the device (while the files reside on a USB hard drive connected to that device). It increased the transfer rate by 10-20% percent. almost hitting the USB limitation. But then again, this was just a short test run and I haven't done more extensive testing to confirm this.
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<diego71> silentcreek: CONFIG_SCHED_SMT is for multi-threaded cpu (hyperthread in intel namespace), so I expect it to not be better than CONFIG_SCHED_MC on A20
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<silentcreek> diego71: Yes, that's my understanding, too. That's why I was skeptical about that and didn't enable it yet. Some debian images for Cubieboards/Banana Pi (Igor Pecovnik's builds and Bananian) enable both for example, but I don't see how that makes sense. I was also surprised that neither sunxi_defconfig nor the debian configuration for sunxi hardware enable CONFIG_SCHED_MC, even though that sounds reasonable.
<silentcreek> So, I thought maybe somebody did some testing or had experience with that.
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<silentcreek> Anyway... I created a patch for the obsolete line in sunxi_defconfig. Since it's my first patch and I don't use git, would somebody care to check the formatting before I send the patch to the maintainers & mailinglists? You can find it here: http://pastebin.com/p4iB3Sv7
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<silentcreek> I'll repeat my question, since I got disconnected before:
<silentcreek> I created a patch for the obsolete line in sunxi_defconfig. Since it's my first patch and I don't use git, would somebody care to check the formatting before I send the patch to the maintainers & mailinglists? You can find it here: http://pastebin.com/p4iB3Sv7
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<silentcreek> One thing, I'm particularily interested in, is whether the diff command I included, should be stripped, since it would obviously not be part of a patch file created this way.
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<paulk-collins> silentcreek, if you're going to send to upstream, I *strongly* suggets that you use git
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<paulk-collins> silentcreek, and you should remove it from v7_multi as well
<paulk-collins> you might also want to mention which commit made that config option deprecated
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<silentcreek> paulk-collins, is there a specific reason for that? I know git is widely used. Yet, for a one-line patch I found it a bit too much effort to set up git. And the diff command used is part of the Linux documentation on how to format patches. BUt if it's really neccesary, I can do that with git too.
<silentcreek> Thanks for the multi_v7_defconfig hint
<libv> so the orange pi people decided they are part of our community.
<silentcreek> You mean by mentioning the original commit that was included in that merge that I mentioned? I wasn't sure which commit hash to mention because if you look up the original commit hash, you wont find it over the kernel git interface.
<libv> nice how one just needs to edit the wiki a few times for that
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<paulk-collins> libv, is there any clear criteria about that btw?
<paulk-collins> silentcreek, one sec, I'm trying to look it up
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<silentcreek> paulk-collins: Ok, thanks. Just in case: Here is what I was referrig to: https://www.kernel.org/doc/Documentation/SubmittingPatches ( Section 1, 1) )
<libv> paulk-collins: not really, but just adding some devices to our wiki definitely is not enough
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<paulk-collins> silentcreek, it's weird, it seems like this was never actually used
<silentcreek> paulk-collins, you mean the driver or that way of submitting patches?
<paulk-collins> the driver
<silentcreek> ok, that _is_ weird, if it was mainlined before
<mripard_> paulk-collins: it was used between 3.16 and 3.19
<silentcreek> well, but I dont even have a sun6i device, so I don't know anyway.. I just noticed it when comparing the resulting .config with the sunxi_defconfig
<paulk-collins> okay
<paulk-collins> silentcreek, regarding hand-crafting patches, it's at the very least unusual and you should probably at least make sure that it applies as-is with git, because that's what maintainers will be doing (mripard_ here) and you don't want to send a patch that doesn't apply
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<paulk-collins> silentcreek, so IMHO it's just as easy to do it all with git
<paulk-collins> it's really not very long to set up
<silentcreek> I see... well, I'll do it with git then
<paulk-collins> if you haven't, it'll prompt for your name and email
<mripard_> and you avoid pissing off the maintainer because you're too good to use their tools and/or read their doc ;)
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<silentcreek> paulk/mripard: Ok, so I set up git now. In my commit message, do I refer to the merge that included the removal of the driver, or to the original commit which can't be found directly in Linus' kernel git logs?
<silentcreek> Or both?
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<mripard_> silentcreek: the commit
<silentcreek> Ok, thanks.
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<TheLinuxBug> .
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