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Improved performance of hash algorithm while (hopefully) not reducing

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the quality of the hash distribution. This does not fix a problem dealing
with poor distribution when using lots of IP aliases and listening
on the same port on every one of them...some other day perhaps; fixing
that requires significant code changes.
The use of xor was inspired by David S. Miller <davem@jenolan.rutgers.edu>
This commit is contained in:
David Greenman 1997-03-03 09:23:37 +00:00
parent 216a8ce058
commit ddd79a9790
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=23324
7 changed files with 22 additions and 19 deletions
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14
sys/netinet/in_pcb.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
* $Id$
* $Id: in_pcb.c,v 1.27 1997/02/22 09:41:29 peter Exp $
*/
#include <sys/param.h>
@ -686,7 +686,7 @@ in_pcblookuphash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard)
/*
* First look for an exact match.
*/
head = &pcbinfo->hashbase[(faddr.s_addr + lport + fport) % pcbinfo->hashsize];
head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
if (inp->inp_faddr.s_addr == faddr.s_addr &&
inp->inp_fport == fport && inp->inp_lport == lport &&
@ -696,7 +696,7 @@ in_pcblookuphash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard)
if (wildcard) {
struct inpcb *local_wild = NULL;
head = &pcbinfo->hashbase[(INADDR_ANY + lport) % pcbinfo->hashsize];
head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
if (inp->inp_faddr.s_addr == INADDR_ANY &&
inp->inp_fport == 0 && inp->inp_lport == lport) {
@ -738,8 +738,8 @@ in_pcbinshash(inp)
{
struct inpcbhead *head;
head = &inp->inp_pcbinfo->hashbase[(inp->inp_faddr.s_addr +
inp->inp_lport + inp->inp_fport) % inp->inp_pcbinfo->hashsize];
head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
LIST_INSERT_HEAD(head, inp, inp_hash);
}
@ -754,8 +754,8 @@ in_pcbrehash(inp)
s = splnet();
LIST_REMOVE(inp, inp_hash);
head = &inp->inp_pcbinfo->hashbase[(inp->inp_faddr.s_addr +
inp->inp_lport + inp->inp_fport) % inp->inp_pcbinfo->hashsize];
head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
LIST_INSERT_HEAD(head, inp, inp_hash);
splx(s);

7
sys/netinet/in_pcb.h
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)in_pcb.h 8.1 (Berkeley) 6/10/93
* $Id$
* $Id: in_pcb.h,v 1.18 1997/02/22 09:41:29 peter Exp $
*/
#ifndef _NETINET_IN_PCB_H_
@ -68,12 +68,15 @@ struct inpcb {
struct inpcbinfo {
struct inpcbhead *listhead;
struct inpcbhead *hashbase;
unsigned long hashsize;
unsigned long hashmask;
unsigned short lastport;
unsigned short lastlow;
unsigned short lasthi;
};
#define INP_PCBHASH(faddr, lport, fport, mask) \
(((faddr) ^ ((faddr) >> 16) ^ (lport) ^ (fport)) & (mask))
/* flags in inp_flags: */
#define INP_RECVOPTS 0x01 /* receive incoming IP options */
#define INP_RECVRETOPTS 0x02 /* receive IP options for reply */

4
sys/netinet/ip_divert.c
View File

@ -30,7 +30,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: ip_divert.c,v 1.6 1997/02/22 09:41:31 peter Exp $
*/
#include <sys/param.h>
@ -109,7 +109,7 @@ div_init(void)
* to allocate a one entry hash list than it is to check all
* over the place for hashbase == NULL.
*/
divcbinfo.hashbase = phashinit(1, M_PCB, &divcbinfo.hashsize);
divcbinfo.hashbase = hashinit(1, M_PCB, &divcbinfo.hashmask);
}
/*

4
sys/netinet/raw_ip.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
* $Id: raw_ip.c,v 1.41 1997/02/13 19:46:45 wollman Exp $
* $Id: raw_ip.c,v 1.42 1997/02/18 20:46:29 wollman Exp $
*/
#include <sys/param.h>
@ -93,7 +93,7 @@ rip_init()
* to allocate a one entry hash list than it is to check all
* over the place for hashbase == NULL.
*/
ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize);
ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
}
static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };

4
sys/netinet/tcp_subr.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id$
* $Id: tcp_subr.c,v 1.34 1997/02/22 09:41:41 peter Exp $
*/
#include <sys/param.h>
@ -107,7 +107,7 @@ tcp_init()
tcp_cleartaocache();
LIST_INIT(&tcb);
tcbinfo.listhead = &tcb;
tcbinfo.hashbase = phashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashsize);
tcbinfo.hashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashmask);
if (max_protohdr < sizeof(struct tcpiphdr))
max_protohdr = sizeof(struct tcpiphdr);
if (max_linkhdr + sizeof(struct tcpiphdr) > MHLEN)

4
sys/netinet/tcp_timewait.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $Id$
* $Id: tcp_subr.c,v 1.34 1997/02/22 09:41:41 peter Exp $
*/
#include <sys/param.h>
@ -107,7 +107,7 @@ tcp_init()
tcp_cleartaocache();
LIST_INIT(&tcb);
tcbinfo.listhead = &tcb;
tcbinfo.hashbase = phashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashsize);
tcbinfo.hashbase = hashinit(TCBHASHSIZE, M_PCB, &tcbinfo.hashmask);
if (max_protohdr < sizeof(struct tcpiphdr))
max_protohdr = sizeof(struct tcpiphdr);
if (max_linkhdr + sizeof(struct tcpiphdr) > MHLEN)

4
sys/netinet/udp_usrreq.c
View File

@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95
* $Id: udp_usrreq.c,v 1.34 1997/02/18 20:46:36 wollman Exp $
* $Id: udp_usrreq.c,v 1.35 1997/02/24 20:31:25 wollman Exp $
*/
#include <sys/param.h>
@ -99,7 +99,7 @@ udp_init()
{
LIST_INIT(&udb);
udbinfo.listhead = &udb;
udbinfo.hashbase = phashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashsize);
udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
}
void