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8a0ad2660a
The original vendor's driver programmed the dma controller's AHB HPROT values to enable bufferable, privileged mode. This along with the "same priorty for both channels" fixes the freezes according to @takimata, @And.short, that have been reported on the forum by @ticerex. Furtheremore, @takimata reported that the patch also improved the performance of the HDDs considerably: |<https://forum.lede-project.org/t/wd-mybook-live-duo-two-disks/16195/55> |It seems your patch unleashed the full power of the SATA port. |Where I was previously hitting a really hard limit at around |82 MB/s for reading and 27 MB/s for writing, I am now getting this: | |root@OpenWrt:/mnt# time dd if=/dev/zero of=tempfile bs=1M count=1024 |1024+0 records in |1024+0 records out |real 0m 13.65s |user 0m 0.01s |sys 0m 11.89s | |root@OpenWrt:/mnt# time dd if=tempfile of=/dev/null bs=1M count=1024 |1024+0 records in |1024+0 records out |real 0m 8.41s |user 0m 0.01s |sys 0m 4.70s | |This means: 121 MB/s reading and 75 MB/s writing! | |[...] | |The drive is a WD Green WD10EARX taken from an older MBL Single. |I repeated the test a few times with even larger files to rule out |any caching, I'm still seeing the same great performance. OpenWrt is |now completely on par with the original MBL firmware's performance. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> |
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| uml | ||
| x86 | ||
| Makefile | ||