From mboxrd@z Thu Jan 1 00:00:00 1970 From: opensource.ganesh@gmail.com (Ganesh Mahendran) Date: Wed, 16 Mar 2016 17:32:23 +0800 Subject: [PATCH] Revert "arm64: Increase the max granular size" Message-ID: <1458120743-12145-1-git-send-email-opensource.ganesh@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 -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 at vger.kernel.org Signed-off-by: Ganesh Mahendran --- 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 -#define L1_CACHE_SHIFT 7 +#define L1_CACHE_SHIFT 6 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT) /* -- 1.7.9.5