Re: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
On Wed, May 06, 2009 at 01:54:15PM +0800, You, Yongkang wrote: On xen-ia64-devel-boun...@lists.xensource.com wrote: Hi, When I try recently Xen (Xen 3.4 rc3) on IA64 machine (Tiger4), I found some strange issue. My two systems have 4 and 8 pcpus separately If VTI guest's vcpus is near pcpus, guest booting will meet some issues: 1. Guest boot might be hang at switch to new root and run init; unmounting old /dev ...; unmounting old /sys for a long time. Does this mean that it's unreasonably slow? And it reached login prompt eventually? Although I haven't tested it yet. 2. After guest boot up, it might report illegal instructions for command or report readonly filesystem. I didn't catch it in UP or 2 vcpus conditions. Looks a qemu issue? Did you meet it also? If I double vcpus ( 2*pcups), this issue is more easy to happen. I didn't try multi guest yet. Thanks, Yongkang ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel -- yamahata ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
On Thursday, May 07, 2009 10:22 AM Isaku Yamahata wrote: On Wed, May 06, 2009 at 01:54:15PM +0800, You, Yongkang wrote: On xen-ia64-devel-boun...@lists.xensource.com wrote: Hi, When I try recently Xen (Xen 3.4 rc3) on IA64 machine (Tiger4), I found some strange issue. My two systems have 4 and 8 pcpus separately If VTI guest's vcpus is near pcpus, guest booting will meet some issues: 1. Guest boot might be hang at switch to new root and run init; unmounting old /dev ...; unmounting old /sys for a long time. Does this mean that it's unreasonably slow? Em. It will stop there for a very long time (multi minutes). And it reached login prompt eventually? I tried many times, but didn't wait for login interface everytime. So couldn't say it would always reach login. Thanks, Yongkang ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
It maybe related to recent DMA emulation changes in qemu, and lead to guest uses incorrect icache for instruction streams. Xiantao -Original Message- From: xen-ia64-devel-boun...@lists.xensource.com [mailto:xen-ia64-devel-boun...@lists.xensource.com] On Behalf Of You, Yongkang Sent: Thursday, May 07, 2009 12:57 PM To: Isaku Yamahata Cc: xen-ia64-devel@lists.xensource.com Subject: RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus On Thursday, May 07, 2009 10:22 AM Isaku Yamahata wrote: On Wed, May 06, 2009 at 01:54:15PM +0800, You, Yongkang wrote: On xen-ia64-devel-boun...@lists.xensource.com wrote: Hi, When I try recently Xen (Xen 3.4 rc3) on IA64 machine (Tiger4), I found some strange issue. My two systems have 4 and 8 pcpus separately If VTI guest's vcpus is near pcpus, guest booting will meet some issues: 1. Guest boot might be hang at switch to new root and run init; unmounting old /dev ...; unmounting old /sys for a long time. Does this mean that it's unreasonably slow? Em. It will stop there for a very long time (multi minutes). And it reached login prompt eventually? I tried many times, but didn't wait for login interface everytime. So couldn't say it would always reach login. Thanks, Yongkang ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus
On xen-ia64-devel-boun...@lists.xensource.com wrote: Hi, When I try recently Xen (Xen 3.4 rc3) on IA64 machine (Tiger4), I found some strange issue. My two systems have 4 and 8 pcpus separately If VTI guest's vcpus is near pcpus, guest booting will meet some issues: 1. Guest boot might be hang at switch to new root and run init; unmounting old /dev ...; unmounting old /sys for a long time. 2. After guest boot up, it might report illegal instructions for command or report readonly filesystem. I didn't catch it in UP or 2 vcpus conditions. Looks a qemu issue? Did you meet it also? If I double vcpus ( 2*pcups), this issue is more easy to happen. I didn't try multi guest yet. Thanks, Yongkang ___ Xen-ia64-devel mailing list Xen-ia64-devel@lists.xensource.com http://lists.xensource.com/xen-ia64-devel
