Date: Sun, 13 Jan 2002 22:33:51 +0100 From: Jesper Skriver <jesper@FreeBSD.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: Michal Mertl <mime@traveller.cz>, arch@freebsd.org Subject: Re: 64 bit counters again Message-ID: <20020113223351.A42689@FreeBSD.org> In-Reply-To: <3C41F3FD.4ECC8CD@mindspring.com>; from tlambert2@mindspring.com on Sun, Jan 13, 2002 at 12:54:21PM -0800 References: <Pine.BSF.4.41.0201132057560.62182-100000@prg.traveller.cz> <3C41F3FD.4ECC8CD@mindspring.com>
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On Sun, Jan 13, 2002 at 12:54:21PM -0800, Terry Lambert wrote: > Michal Mertl wrote: > > But anyway I continued on some work on STABLE (but believe lot of my work > > could be used on CURRENT after some modification) and get kernel and world > > building with 64 bit counters on network interfaces (struct if_data) > > and in protocols (struct ipstat, tcpstat, udpstat, icmpstat, igmpstat). > > Not to discount the value of this work, but... > > 1) It makes counting slower on 32 bit processors. > > 2) The values are not accessible from SNMP, which is > limited to 32 bit counters. SNMPv2 can do 64 bit counters ... > 3) While you could export these values as strings and > not numbers over SNMP, doing this would mean you > would need to use a MIB which was not a superset > of an RFC'ed MIB. One could also export them as 2 32 bit counters, one for the high 32 bits one for the low 32 bits, this is a common trick ... > So it seems to me that the utility of this on 32 bit machines > is incredibly limited (e.g. shell programs). > > PS: FWIW, I agree that these things should be 64 bits on > 64 bit architectures, even if they can only export > the low 32 bits for SNMP. /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 Work: Network manager @ AS3292 (Tele Danmark DataNetworks) Private: FreeBSD committer @ AS2109 (A much smaller network ;-) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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