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| author | Julien Dusser <julien.dusser@free.fr> | 2017-07-19 14:52:35 +0200 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2017-10-24 13:24:04 +0200 |
| commit | 8c5702f2a07cebfbee6f9e628b63d88b8806ca1b (patch) | |
| tree | db2ce879a3a0a19d441362f1dc681dc8e742b6dd /target/linux/ar71xx/image/lzma-loader | |
| parent | 06e41056aab12f5fb6c35789d0bde71bcf1dc90e (diff) | |
| download | upstream-8c5702f2a07cebfbee6f9e628b63d88b8806ca1b.tar.gz upstream-8c5702f2a07cebfbee6f9e628b63d88b8806ca1b.tar.bz2 upstream-8c5702f2a07cebfbee6f9e628b63d88b8806ca1b.zip | |
ar71xx: fix lzma loader performance issues
Some bootloaders set a cache cohenrency to a very slow mode. Use code from
Linux kernel to set it to "Cacheable, noncoherent, write-back, write
allocate".
Perfomance impact is significant on TP-Link EAP245 board, kernel
decompression time fall from 33 seconds to less than 1.
Signed-off-by: Julien Dusser <julien.dusser@free.fr>
Diffstat (limited to 'target/linux/ar71xx/image/lzma-loader')
| -rw-r--r-- | target/linux/ar71xx/image/lzma-loader/src/head.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/target/linux/ar71xx/image/lzma-loader/src/head.S b/target/linux/ar71xx/image/lzma-loader/src/head.S index 47a7c9bd63..d414b14d11 100644 --- a/target/linux/ar71xx/image/lzma-loader/src/head.S +++ b/target/linux/ar71xx/image/lzma-loader/src/head.S @@ -42,6 +42,19 @@ LEAF(startup) mtc0 t0, CP0_STATUS ehb + /* + * Some bootloaders set the 'Kseg0 coherency algorithm' to + * 'Cacheable, noncoherent, write-through, no write allocate' + * and this cause performance issues. Let's go and change it to + * 'Cacheable, noncoherent, write-back, write allocate' + */ + mfc0 t0, CP0_CONFIG + li t1, ~7 #~CONF_CM_CMASK + and t0, t1 + ori t0, 3 #CONF_CM_CACHABLE_NONCOHERENT + mtc0 t0, CP0_CONFIG + nop + mtc0 zero, CP0_COUNT mtc0 zero, CP0_COMPARE ehb |