From 72bcbfc0ae424fa9e61fcc6259e4ed64502b9f38 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 3 Sep 1999 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1999-09-03

---
 port/cache.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/port/cache.c b/port/cache.c
index 85b0e43e063bc3d0e890dbc9e9e1330671fedf46..2754f11a1b2f8456ad5480330f4d5765d9e05bd1 100644
--- a/port/cache.c
+++ b/port/cache.c
@@ -58,6 +58,7 @@ struct Ecache
 static Image fscache;
 static Cache cache;
 static Ecache ecache;
+static int maxcache = MAXCACHE;
 
 static void
 extentfree(Extent* e)
@@ -109,6 +110,9 @@ cinit(void)
 	cache.head = xalloc(sizeof(Mntcache)*NFILE);
 	m = cache.head;
 
+	if(conf.npage*BY2PG > 200*MB)
+		maxcache = 10*MAXCACHE;
+
 	for(i = 0; i < NFILE-1; i++) {
 		m->next = m+1;
 		m->prev = m-1;
@@ -290,7 +294,7 @@ cread(Chan *c, uchar *buf, int len, vlong off)
 	int o, l, total;
 	ulong offset;
 
-	if(off+len > MAXCACHE)
+	if(off+len > maxcache)
 		return 0;
 
 	m = c->mcp;
@@ -453,7 +457,7 @@ cupdate(Chan *c, uchar *buf, int len, vlong off)
 	int o, ee, eblock;
 	ulong offset;
 
-	if(off > MAXCACHE || len == 0)
+	if(off > maxcache || len == 0)
 		return;
 
 	m = c->mcp;
@@ -563,7 +567,7 @@ cwrite(Chan* c, uchar *buf, int len, vlong off)
 	Extent *p, *f, *e, *tail;
 	ulong offset;
 
-	if(off > MAXCACHE || len == 0)
+	if(off > maxcache || len == 0)
 		return;
 
 	m = c->mcp;