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
