Date: Tue, 06 Apr 1999 04:20:38 -0700 From: Darren Pilgrim <dpilgrim@uswest.net> To: unknown@riverstyx.net Cc: Mark Ovens <marko@uk.radan.com>, Greg Lehey <grog@lemis.com>, Leif Neland <leif@neland.dk>, FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: K6-2/333, was: Re: Debug kernel by default (was: System sizewith-g) Message-ID: <3709EE06.77F97B9E@uswest.net> References: <Pine.LNX.4.04.9904051744500.31071-100000@hades.riverstyx.net>
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unknown@riverstyx.net wrote: >On Mon, 5 Apr 1999, Darren Pilgrim wrote: >>unknown@riverstyx.net wrote: >>>I may be out to lunch on this one, but I'm pretty sure that the multiplier >>>is for the internal clock of the chip. So, if, after applying the >>>multiplier to one chip you get 300MHz, and after applying a different >>>multiplier to a different chip with a different bus speed you also get >>>300MHz, you get two chips that perform the exact same number of >>>operations/sec. The difference is the bus speed, which affects I/O >>>performance, etc. A 100 MHz bus with a x3 multiplier will outperform a 66 >>>MHz bus with a x4.5 multiplier because the CPU will have to wait more >>>often when it wants to fetch non-cached data from RAM. >> >>While this is mathematically and theoretically sound thinking, tests >>have shown that there is little CPU/memory performance gain with a >>100MHz bus. Just take a look at www.tomshardware.com. As for my own >>systems, I run K6-2 333s at 5x66 just because it sets the PCI and AGP >>clocks at their spec'd rate of 33 and 66MHz, respectively, while >>providing the CPU's spec'd 333MHz. > >I've seen good speed gains by moving to a 100MHz bus, although this was >for servers that were doing a lot of database work and heavy network >traffic. Perhaps it wouldn't matter much for servers doing more >calculation-intensive work? Aye, in a server setup a faster bus does make a difference, but my reference (Tom's HW) is for workstations. Did I miss the first part of the thread, was this discussion about servers? If so, my apologies for my misunderstanding. Disk and memory work in a server can max a slower FSB, but if the server is being used for CPU-intensive work, then what's the point of spending extra for a server? -- dpilgrim@uswest.net /\ / __ Our lies are merely the gryph@mindless.com / \/OC/URNE truth of another world ICQ: 29880099 Death is not a kill -9, just a DALnet: anim0s make world and shutdown -r now PGPKey available To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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