Re: VPC6 - dual nics
From: Steve Jain (essjae-No_at_Spam-hotmail.com)
Date: 07/04/04
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Date: Sun, 04 Jul 2004 11:51:12 -0700
No, there is no way to use a 2nd NIC in VPC for Mac.
On 4 Jul 2004 04:52:13 -0700, jean-michel.albert@wanadoo.fr
(Jean-Miche) wrote:
>Ray Flinkerbusch <ray@flinkerbusch.net> wrote in message news:<BD0B1B31.65A6%ray@flinkerbusch.net>...
>> Hi all,
>>
>> Does anyone know somesort of trick to get to use more than 1 nic for a
>> virtual machine?
>>
>> In the Windows version of VPC it's possible to use more nics for a virtual
>> machine however the Mac version (I'm using 6.1.1) is left with just one nic.
>>
>> Ray
>
>>From VP5 techupdate (when Connectix was still the owner)
>
>"Q: Virtual PC 5 has "Dual processor support" when running on Mac OS
>X.
>Where will I see additional performance on my dual-processor Mac?
>A: When Virtual PC runs in ‘windowed' mode, it is not able to directly
>write the pixels to the video memory (as it does in full-screen mode).
>However, on a dual processor machine, all video updates are performed
>on a separate thread, which is typically scheduled to run on the
>second processor. Evidence of this can be seen by watching the "CPU
>Monitor" utility while Virtual PC is performing video operations.
>Virtual PC also uses separate "threads" of operation to perform all
>I/O
>operations (e.g. disk and networking). These threads can be scheduled
>on a second processor, but the overhead of inter-processor
>synchronization limits the benefit in these cases.
>Please note that multiple processors will not speed up the raw Pentium
>emulation. So, it is unlikely that Windows will run significantly
>faster on your dual-processor Mac.
>Multiple processors only provide performance benefits for software
>implementations that are "parallellizable" (i.e. can run at the same
>time). Emulation of a Pentium processor, by its very nature, is a very
>non-parallellizable problem.
>It should be noted that Mac OS X can and does effectively make use of
>multiple processors to dole out processor time to programs.
>For example, if you have two compute-bound programs (e.g. iTunes and
>Virtual PC) running simultaneously, the OS is able to schedule these
>on separate processors rather than "time slicing" between the two
>programs. So, users with multi-processor machines are less likely to
>run into the processor scheduling problems caused by two compute-bound
>applications competing for the same processor."
>
>The software is the same, just improved by the owner, now Microsoft,
>but it's the same for VPC 6.1.1
>In the VPC 6 help, and especially in guided view and then in Mac OS X
>capacities the last rubric, it's said " when VPC runs under OS X and
>with a mac with 2 processors, VPC will use the second processor to
>update the screen, which gives a better performance for VPC and
>Windows."
Steve Jain, Microsoft MVP for Virtual PC for Windows
Website: http://www.essjae.com
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