Date: Sun, 14 Sep 1997 00:30:34 -0700 (PDT) From: Simon Shapiro <Shimon@i-connect.net> To: Terry Lambert <tlambert@primenet.com> Cc: freebsd-smp@freebsd.org, (Paul Missman) <missmanp@milo.cfw.com> Subject: Re: SMP in FreeBSD 3.x.x Message-ID: <XFMail.970914003034.Shimon@i-Connect.Net> In-Reply-To: <199709140424.VAA07740@usr08.primenet.com>
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Hi Terry Lambert; On 14-Sep-97 you wrote: > > I see that the SMP source was merged with the 3.x.x development > > kernal. > > Does this mean that 3.x.x, when released, will seamlessly support 1 - N > > processors? Also, what do you imagine maximum N will be at 3.x.x > > release > > time? I believe the original Intel spec was up to 4 processors, but I > > see a > > lot of 8 processor servers coming out lately. > > A system can have up to 32 APICs. It is the APIC IDs that limit > the number of processors. > > Given that a system will have an I/O APIC, the max is 31 (except > for I2O systems, where the i960 also has an APIC, or systems with > multiple bus controllers -- each with an APIC). > > So ~30. When I worked at that awful place, we actually computed how many processors one could put on the P6 bus. The number was much, much lower than 30. Our number was based on trying to have the CPUs access memory and I/O. --- Sincerely Yours, (Sent on 14-Sep-97, 00:27:05 by XF-Mail) Simon Shapiro Atlas Telecom Senior Architect 14355 SW Allen Blvd., Suite 130 Beaverton OR 97005 Shimon@i-Connect.Net Voice: 503.643.5559, Emergency: 503.799.2313
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