From: Willy Tarreau <w@1wt.eu>
Date: Sun, 26 Nov 2017 10:08:14 +0000 (+0100)
Subject: MINOR: buffers: cache-align buffer_wq_lock
X-Git-Tag: v1.8.0~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6a2f5899361c0de45048b2d7b7104ad2a27f16b;p=thirdparty%2Fhaproxy.git

MINOR: buffers: cache-align buffer_wq_lock

This lock is highly stressed, avoid cache-line sharing to limit stress.
---

diff --git a/src/buffer.c b/src/buffer.c
index 4e726b09a0..167b75ae7d 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -33,7 +33,7 @@ struct buffer buf_wanted = { .p = buf_wanted.data };
 
 /* list of objects waiting for at least one buffer */
 struct list buffer_wq = LIST_HEAD_INIT(buffer_wq);
-__decl_hathreads(HA_SPINLOCK_T buffer_wq_lock);
+__decl_hathreads(HA_SPINLOCK_T __attribute__((aligned(64))) buffer_wq_lock);
 
 /* this buffer is always the same size as standard buffers and is used for
  * swapping data inside a buffer.