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Add nmbcnt sysctl and make it tunable at boottime; nmbcnt is the

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number of ext_buf counters that are possibly allocatable.

Do this because:

  (i) It will make it easier to influence EXT_COUNTERS for if_sk,
      if_ti (or similar) users where the driver allocates its own
      ext_bufs and where it is important for the mbuf system to take
      it into account when reserving necessary space for counters.

  (ii) Facilitate some percentile calculation for netstat(1)
This commit is contained in:
Bosko Milekic 2000-10-15 06:24:07 +00:00
parent 6bf6c91f5d
commit 181d2a1564
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=67144
1 changed files with 5 additions and 1 deletions
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6
sys/kern/uipc_mbuf.c
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@ -60,6 +60,7 @@ int max_hdr;
int max_datalen;
int nmbclusters;
int nmbufs;
int nmbcnt;
u_long m_mballoc_wid = 0;
u_long m_clalloc_wid = 0;
@ -91,11 +92,14 @@ SYSCTL_INT(_kern_ipc, KIPC_NMBCLUSTERS, nmbclusters, CTLFLAG_RD,
&nmbclusters, 0, "Maximum number of mbuf clusters available");
SYSCTL_INT(_kern_ipc, OID_AUTO, nmbufs, CTLFLAG_RD, &nmbufs, 0,
"Maximum number of mbufs available");
SYSCTL_INT(_kern_ipc, OID_AUTO, nmbcnt, CTLFLAG_RD, &nmbcnt, 0,
"Maximum number of ext_buf counters available");
#ifndef NMBCLUSTERS
#define NMBCLUSTERS (512 + MAXUSERS * 16)
#endif
TUNABLE_INT_DECL("kern.ipc.nmbclusters", NMBCLUSTERS, nmbclusters);
TUNABLE_INT_DECL("kern.ipc.nmbufs", NMBCLUSTERS * 4, nmbufs);
TUNABLE_INT_DECL("kern.ipc.nmbcnt", EXT_COUNTERS, nmbcnt);
static void m_reclaim __P((void));
@ -119,7 +123,7 @@ mbinit(dummy)
/*
* Setup the mb_map, allocate requested VM space.
*/
mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES + EXT_COUNTERS
mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES + nmbcnt
* sizeof(union mext_refcnt);
mb_map_size = roundup2(mb_map_size, PAGE_SIZE);
mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr,