Messages in this thread Patch in this message | | | From | Ganesh Mahendran <> | Subject | [PATCH] Revert "arm64: Increase the max granular size" | Date | Wed, 16 Mar 2016 17:32:23 +0800 |
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Reverts commit 97303480753e ("arm64: Increase the max granular size").
The commit 97303480753e ("arm64: Increase the max granular size") will degrade system performente in some cpus.
We test wifi network throughput with iperf on Qualcomm msm8996 CPU: ---------------- run on host: # iperf -s run on device: # iperf -c <device-ip-addr> -t 100 -i 1 ----------------
Test result: ---------------- with commit 97303480753e ("arm64: Increase the max granular size"): 172MBits/sec
without commit 97303480753e ("arm64: Increase the max granular size"): 230MBits/sec ----------------
Some module like slab/net will use the L1_CACHE_SHIFT, so if we do not set the parameter correctly, it may affect the system performance.
So revert the commit.
Cc: stable@vger.kernel.org Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com> --- arch/arm64/include/asm/cache.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h index 5082b30..bde4499 100644 --- a/arch/arm64/include/asm/cache.h +++ b/arch/arm64/include/asm/cache.h @@ -18,7 +18,7 @@ #include <asm/cachetype.h> -#define L1_CACHE_SHIFT 7 +#define L1_CACHE_SHIFT 6 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT) /* -- 1.7.9.5
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