Date: Thu, 15 Feb 1996 22:44:13 +0900 From: Naoki Hamada <nao@sbl.cl.nec.co.jp> To: hackers@FreeBSD.ORG Subject: mbuf enhancement patch Message-ID: <199602151344.WAA16411@sirius.sbl.cl.nec.co.jp>
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Hello, guys!
I found mbuf's are not buffered though mclusters are. So here is my
patch for /sys/sys/mbuf.h. This seems to provide me slightly good
network performance.
-nao
--- mbuf.h.orig Thu Feb 15 20:48:22 1996
+++ mbuf.h Thu Feb 15 21:35:27 1996
@@ -165,6 +165,8 @@
/*
* mbuf allocation/deallocation macros:
*
+ * MMALLOC(struct mbuf *m, int how, int type)
+ * allocates an mbuf.
* MGET(struct mbuf *m, int how, int type)
* allocates an mbuf and initializes it to contain internal data.
*
@@ -172,8 +174,18 @@
* allocates an mbuf and initializes it to contain a packet header
* and internal data.
*/
+#define MMALLOC(m, how, type) \
+ MBUFLOCK( \
+ if (mfree == 0) {\
+ MALLOC((m), struct mbuf *, MSIZE, mbtypes[type], (how)); \
+ } else { \
+ (m) = mfree; \
+ mfree = (m)->m_next; \
+ } \
+ )
+
#define MGET(m, how, type) { \
- MALLOC((m), struct mbuf *, MSIZE, mbtypes[type], (how)); \
+ MMALLOC((m), (how), (type)); \
if (m) { \
(m)->m_type = (type); \
MBUFLOCK(mbstat.m_mtypes[type]++;) \
@@ -186,7 +198,7 @@
}
#define MGETHDR(m, how, type) { \
- MALLOC((m), struct mbuf *, MSIZE, mbtypes[type], (how)); \
+ MMALLOC((m), (how), (type)); \
if (m) { \
(m)->m_type = (type); \
MBUFLOCK(mbstat.m_mtypes[type]++;) \
@@ -270,7 +282,10 @@
MCLFREE((m)->m_ext.ext_buf); \
} \
(nn) = (m)->m_next; \
- FREE((m), mbtypes[(m)->m_type]); \
+ MBUFLOCK ( \
+ (m)->m_next = mfree; \
+ mfree = (m); \
+ ) \
}
#endif
@@ -358,6 +373,7 @@
};
#ifdef KERNEL
+struct mbuf *mfree;
extern struct mbuf *mbutl; /* virtual address of mclusters */
extern char *mclrefcnt; /* cluster reference counts */
struct mbstat mbstat;
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