Messages in this thread | | | From | Dan MacDonald <> | Date | Wed, 8 Feb 2017 23:38:47 +0000 | Subject | Re: ARM imx.6 SATA speed regression |
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Hi all
I'm still running the same 4.9.8 Arch kernel I was a few days ago and I haven't done any updates but I decided to run hdparm again, a few times actually, and now I'm getting 120/125 MB/s again on my SABRE lite, as I was under 4.9.0.
When I last ran hdparm I ran it a few times and all the results were all around 90 MB/s. I have no idea what caused those results to be so far below the norm.
If I discover what the cause was I'll let you know but otherwise I'm sorry about the noise!
Dan
On Wed, Feb 8, 2017 at 6:38 PM, Dan MacDonald <allcoms@gmail.com> wrote: > Hi Gary > > I'll hopefully get to try some different kernels tonight or tomorrow > night, otherwise it may have to wait until the weekend. > > As for bisecting and cross-compiling (which I won't have time to try > again until this weekend), maybe not having cross-compilation working > won't be such an obstacle provided I dont have to rebuild every kernel > source file each time. I'm guessing I'll have to try approx 7 to 10 > kernel builds before the commit to blame is found, right? I've not > built a kernel on my SABRE Lite yet but I recall building the generic > armv7h kernel under Arch took approx 12 hours on my Banana Pi, which > isn't that much slower than that the SL and has the same amount of RAM > so at least the first build will take a smiliar amount of time. > > I'll update you all as soon as I have at least tried the various Arch > kernel packages to narrow it down more. > > Thanks > > On Wed, Feb 8, 2017 at 5:48 PM, Gary Bisson > <gary.bisson@boundarydevices.com> wrote: >> Hi Dan, >> >> On Tue, Feb 07, 2017 at 05:02:40PM +0000, Dan MacDonald wrote: >>> Thankfully there is an archive of older Arch ARM packages which should >>> reduce the amount amount of bisection / compiling I may need to do and >>> they have packages for most stable kernels between 4.9.0 and 4.9.8 >>> >>> http://tardis.tiny-vps.com/aarm/packages/l/linux-armv7/ >> >> How did that go? >> >> I've tried 'hdparm -Tt' on several kernel version and couldn't confirm >> your obervations: >> >> 4.9.0: >> Timing buffer-cache reads: 366 MB in 0.51 seconds = 733382 kB/s >> Timing buffered disk reads: 221 MB in 3.00 seconds = 75411 kB/s >> >> 4.9.8: >> Timing buffer-cache reads: 358 MB in 0.51 seconds = 717720 kB/s >> Timing buffered disk reads: 221 MB in 3.00 seconds = 75244 kB/s >> >> 4.10-rc7: >> Timing buffer-cache reads: 360 MB in 0.50 seconds = 723576 kB/s >> Timing buffered disk reads: 244 MB in 3.00 seconds = 83024 kB/s >> >> Are you sure rolling back to 4.9.0 improves the perf in your case? >> >> Regards, >> Gary
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