From: Daniel Stodden <daniel.stodden@citrix.com>
Date: Thu, 9 Sep 2010 09:05:37 +0000 (-0700)
Subject: PR-1053: Fix bounce buffer allocation size.
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8492648ac360f29c00b9ec07ea9c35a9ede7f556;p=people%2Fdstodden%2Fblktap.git

PR-1053: Fix bounce buffer allocation size.

Anticipate significantly less than 2816 requests in flight.

Times 11 * 4k buffer space, this was worth 121MB memory, mlocked.

Since segment treqs are merged, use ring size with some extra headroom
for splits.

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
---

diff --git a/drivers/block-lcache.c b/drivers/block-lcache.c
index 451f4e2..dd9dba8 100644
--- a/drivers/block-lcache.c
+++ b/drivers/block-lcache.c
@@ -52,7 +52,7 @@
 #define BUG()           td_panic()
 #define BUG_ON(_cond)   if (_cond) { td_panic(); }
 
-#define LOCAL_CACHE_REQUESTS            (TAPDISK_DATA_REQUESTS << 3)
+#define LOCAL_CACHE_REQUESTS            (BLK_RING_SIZE*2)
 
 typedef struct local_cache              local_cache_t;