Could it be that my Intel Pentium Dual Core E6300 2.8 GHz processor is not powerful enough? Maybe need to upgrade to Intel Core 2 Quad? -- Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering) Alma Maters: (1) Singapore Polytechnic (2) National University of Singapore My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com My Secondary Blog: http://enmingteo.wordpress.com My Youtube videos: http://www.youtube.com/user/enmingteo Email: space.time.universe@gmail.com Mobile Phone (Starhub Prepaid): +65-8369-2618 Street: Bedok Reservoir Road Country: Singapore On Mon, Nov 9, 2009 at 6:52 PM, Mr. Teo En Ming (Zhang Enming) < space.time.universe@gmail.com> wrote: > Hi, > > Please watch this 4-minute video at > http://www.youtube.com/watch?v=LbLaPpwNAx4 > > I have only started 3 HVM Linux guests with 1 GB ram each. I can't start > the 4th HVM guest. If I attempt to start the 4th instance, it will crash > dom0. > > Are there anything in the xm dmesg output that could explain the low limit > to the number of VMs that I could start before dom0 becomes unresponsive? > > Thank you. > > > -- > Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical > Engineering) > Alma Maters: > (1) Singapore Polytechnic > (2) National University of Singapore > My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com > My Secondary Blog: http://enmingteo.wordpress.com > My Youtube videos: http://www.youtube.com/user/enmingteo > Email: space.time.universe@gmail.com > Mobile Phone (Starhub Prepaid): +65-8369-2618 > Street: Bedok Reservoir Road > Country: Singapore > > On Mon, Nov 9, 2009 at 4:17 PM, Robert Dunkley wrote: > >> There seems to also be a limit imposed by CPU context switching. Ie. Once >> you have enough VMs trying to grab a cpu core things come to a standstill as >> the cpu spends most of its time switching rather than processing. The most >> common bottleneck I find is disk performance but this depends hugely on what >> your VMs are doing. >> >> -----Original Message----- >> From: xen-users-bounces@lists.xensource.com [mailto: >> xen-users-bounces@lists.xensource.com] On Behalf Of Moi meme >> Sent: 08 November 2009 13:02 >> To: Mr. Teo En Ming (Zhang Enming) >> Cc: xen-devel@lists.xensource.com; xen-users@lists.xensource.com >> Subject: Re: [Xen-users] Max. PV and HVM Guests >> >> Hello, >> >> The maximum is a direct function of the available memory, every new >> machine "eats" some memory and when there is no more memory ...... >> I had some servers (64bits, 2 quad core and 32Gb Ram) running 19 VM, >> 2003 server, 2000 Server,Fedora, Debian all in 32bits. >> In my own system I have tested with upto 10 VMs of 512M each without >> breaking the system. >> >> Regards >> >> JP Pozzi >> >> Le dimanche 08 novembre 2009 à 19:45 +0800, Mr. Teo En Ming (Zhang >> Enming) a écrit : >> > Hi, >> > >> > I have observed that there is a maximum limit to the number of PV or >> > HVM virtual machines you can start before dom0 hangs or crashes. >> > >> > For Fedora 11 Linux x86-64 PV guests, dom0 will crash when I start the >> > 7th instance. Max I can start is 6 without crashing. >> > >> > For CentOS 5.2 Linux x86-64 HVM guests, dom0 will crash when I start >> > the 4th instance. Max I can start is 3 without crashing. >> > >> > I have 6 GB of DDR2-800 with Intel Pentium Dual Core E6300 2.8 GHz on >> > Intel DQ45CB motherboard. >> > >> > Are the above limits reasonable considering the hardware >> > specifications of my computer? >> > >> > I am using Xen 3.5-unstable changeset 20143 with pv-ops dom0 kernels >> > 2.6.30-rc3, 2.6.31-rc6, 2.6.31.1, 2.6.31.4, and 2.6.31.5. My host >> > operating system is Fedora 11 Linux x86-64. >> > >> > -- >> > Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical >> > Engineering) >> > Alma Maters: >> > (1) Singapore Polytechnic >> > (2) National University of Singapore >> > My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com >> > My Secondary Blog: http://enmingteo.wordpress.com >> > My Youtube videos: http://www.youtube.com/user/enmingteo >> > Email: space.time.universe@gmail.com >> > Mobile Phone (Starhub Prepaid): +65-8369-2618 >> > Street: Bedok Reservoir Road >> > Country: Singapore >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com >> > http://lists.xensource.com/xen-users >> >> >> >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> >> The SAQ Group >> >> Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ >> SAQ is the trading name of SEMTEC Limited. 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