[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-bugs] [Bug 659] New: only one CPU is detected when dom0 boots up
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=659 Summary: only one CPU is detected when dom0 boots up Product: Xen Version: unstable Platform: Other OS/Version: All Status: NEW Severity: normal Priority: P2 Component: Guest-OS AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx ReportedBy: ping.y.yu@xxxxxxxxx CC: xiao.zhang@xxxxxxxxx Buildingx en0 kernel with bulidconfig/linux-defconfig_xen0_x86_64 orbulidconfig/linux-defconfig_xen0_x86_64, with "CONFIG_SMP=y". When dom0 boots up, /proc/cpuinfo will show only one CPU for SMP. Howwever, "uname -a" will show the kernel is SMP. After investigation, I found change set 10139 cause the problem. some discuss in xen-devel is attached. --------------------------------------------- On 26 May 2006, at 00:22, Yu, Ping Y wrote: > I notice that it is caused by change set 10139, then does it mean that > we have > to configure CPU hot plug to start multiple CPUs in the future? It's needed for domU's. Dom0 can bring up SMP without hotplug infrastructure. -- Keir >-----Original Message----- >From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx >[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Yu, Ping Y >Sent: 2006å¹´5æ??25æ?¥ 16:01 >To: Ryan Harper >Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Zheng, Jeff >Subject: RE: [Xen-devel] only one CPU is detected when dom0 boots up > >Harper, > >Thanks a lot. It works! But the question remains that why change set 10033 >could bring up multiple CPUs without hotplug. >I notice that there is no change in build configuration since 9980. > >Ping > >>-----Original Message----- >>From: Ryan Harper [mailto:ryanh@xxxxxxxxxx] >>Sent: 2006å¹´5æ??25æ?¥ 10:44 >>To: Yu, Ping Y >>Cc: Zheng, Jeff; xen-devel@xxxxxxxxxxxxxxxxxxx >>Subject: Re: [Xen-devel] only one CPU is detected when dom0 boots up >> >>* Yu, Ping Y <ping.y.yu@xxxxxxxxx> [2006-05-25 11:59]: >>> Harper, >>> >>> You are right! The default build configuration linux-defconfig_xen0_x86_64/ >>> linux-defconfig_xen0_x86_32 is UP, and we have manually changed the default >>> configure to make it SMP. We noticed that "uname -a" shows the dom0's kernel >>is >>> SMP, but the problem is that only one CPU is found when dom0 boots up. >>> With the same change, we know at least change set 10033 is OK to boot with >>> multiple CPUs. >> >>Make sure CONFIG_HOTPLUG_CPU is also enabled. After having both >>CONFIG_SMP and CONFIG_HOTPLUG_CPU, try: >> >>xm vcpu-set 0 2 >> >>replacing 2 with however many cpu's you think dom0 should have. >> >>-- >>Ryan Harper >>Software Engineer; Linux Technology Center >>IBM Corp., Austin, Tx >>(512) 838-9253 T/L: 678-9253 >>ryanh@xxxxxxxxxx -- Configure bugmail: http://bugzilla.xensource.com/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. _______________________________________________ Xen-bugs mailing list Xen-bugs@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-bugs
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