Revert "arm64: Increase the max granular size"

This reverts commit 626710f1d2332bbe14b6a3e6eda6a72424dc5cc3.

Commit 626710f1d233 ("arm64: Increase the max granular size") increased
the cache line size to 128 to match Cavium ThunderX, apparently for some
performance benefit which could not be confirmed. This change, however,
has an impact on the network packet allocation in certain circumstances,
requiring slightly over a 4K page with a significant performance
degradation. The patch reverts L1_CACHE_SHIFT back to 6 (64-byte cache
line).

Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index 9bbffc7a301f976458fc032c77472e2520105f00..1dd2c2db0010cfdf4fc42526f801bf044263c97d 100644 (file)
--- a/arch/arm64/include/asm/cache.h
+++ b/arch/arm64/include/asm/cache.h
@@ -33,7 +33,7 @@
 #define ICACHE_POLICY_VIPT     2
 #define ICACHE_POLICY_PIPT     3
 
-#define L1_CACHE_SHIFT         7
+#define L1_CACHE_SHIFT         (6)
 #define L1_CACHE_BYTES         (1 << L1_CACHE_SHIFT)
 
 /*