From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Venefax" Subject: Windows SMP Date: Sat, 27 Dec 2008 22:01:29 -0500 Message-ID: <036501c96898$959aaef0$c0d00cd0$@com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1554881586==" Return-path: Content-Language: en-us List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org This is a multipart message in MIME format. --===============1554881586== Content-Type: multipart/alternative; boundary="----=_NextPart_000_0366_01C9686E.ACC4A6F0" Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0366_01C9686E.ACC4A6F0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I think that we need to tackle the absurd loss of performance that any Windows HVM incurs with more than one processor. I have measured it and it is amazing. I have an application that opens 15 independent network clients, and with one single processor and the Standard PC Hal, it takes a little over a minute to load the 15 clients and also to register with the SIP provider. If I leave that unchanged, I mean "ceteris paribus" , and only change the HAL to ACPI and add 8 processors, then the same operation takes over 10 minutes. Hello!!! I am using the GPLVL drivers from James Harper. Right now I am about to test the MPS -Non-ACPI HAL, but the driver still create a BSOD. Maybe the problem is only ACPI, and not MPS, who knows. In any case, what can we do so any Windows virtual machine can achieve a "normal" performance, I mean, a linear performance when using more processors and not this declining curve that can kill any host. Federico ------=_NextPart_000_0366_01C9686E.ACC4A6F0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I think that we need to tackle the absurd loss of performance that any Windows HVM incurs with more than one processor. I = have measured it and it is amazing. I have an application that opens 15 = independent network clients, and with one single processor and the Standard PC Hal, it takes = a little over a minute to load the 15 clients and also to register with = the SIP provider. If I leave that unchanged, I mean “ceteris paribus” , and = only change the HAL to ACPI and add 8 processors, then the same operation = takes over 10 minutes. Hello!!! I am using the GPLVL drivers from James Harper. = Right now I am about to test the MPS –Non-ACPI HAL, but the driver still = create a BSOD. Maybe the problem is only ACPI, and not MPS, who knows. In any = case, what can we do so any Windows virtual machine can achieve a = “normal” performance, I mean, a linear performance when using more processors and = not this declining curve that can kill any host.

Federico

 

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