when we use the Xen4.8.7(we compile from the source and install on SUSE 12 ), if we create the VM, we got the error information:
libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: /etc/xen/scripts/vif-bridge online [8284] exited with error status 127 libxl: error: libxl_create.c:1461:domcreate_attach_devices: unable to add nic devices our config file is(we called "xl create -c cfg" to create the vm) : arch = 'x86_64' #name = "sample_evn_win7_x64" name = "aap_40" memory = 1024 vcpus = 1 builder='hvm' boot = "cd" vif = [ "mac=18:C5:8A:15:C1:39,bridge=virbr0" ] hap = 1 acpi = 1 altp2mhvm = 1 shadow_memory = 16 disk = [ 'tap:qcow2:/home/huawei/vm/win7_x64/win7_work40.qcow2,xvda,w' ] vnc = 1 vnclisten="0.0.0.0" usb=1 usbdevice = "tablet" could you plz help us why this error happen? How to resolve it ? thank you, wish your reply. -----邮件原件----- 发件人: Wei Liu [mailto:wei.l...@citrix.com] 发送时间: 2017年11月13日 17:51 收件人: Chenjia (C) <chenji...@huawei.com> 抄送: wei.l...@citrix.com; HUANG SHENGQIANG <huang.shengqi...@huawei.com>; Yaoshaomin <yaoshao...@huawei.com>; xen-devel@lists.xenproject.org 主题: Re: 答复: Re: [Xen-devel] Help：Can xen restore several snapshots more faster at same time？ Please avoid top-posting. On Mon, Nov 13, 2017 at 08:25:16AM +0000, Chenjia (C) wrote: > 1. is there some way to improve the xenstored process performance? > The latest version of Cxenstored and Oxenstored have improved transaction handling. Not sure which version you're using. > 2. We also try the virsh tool to restore several xen at same > time ,we fount the virsh can restore 40+ snapshot(1G per snapshot) at > same time, the performance is good when snapshot is all in ramdisk. > But we can’t let all the snapshot is always in ramdisk for it is too > big. Is there some way to reduce these virsh snapshots space?(these > snapshot is same: same OS, same config, but need with different IP > address) For libvirt question you need to ask on libvirt list. > > Would you please offer us some feedback? Thanks. > By the way, can we talk with Chinese if possible? Sorry but communication on mailing list needs to be in English so other people can join the discussion and / or provide suggestions. > > 发件人: HUANG SHENGQIANG > 发送时间: 2017年11月6日 18:32 > 收件人: Chenjia (C) <chenji...@huawei.com<mailto:chenji...@huawei.com>> > 主题: FW: Re: [Xen-devel] Help：Can xen restore several snapshots more > faster at same time？ > > -------------------------------------------------- > HUANG SHENGQIANG HUANG SHENGQIANG > M: > +86-18201587800<tel:+86-18201587800>(优先)/+1-6046180423<tel:+1-60461804 > 23>(海外出差) > E: huang.shengqi...@huawei.com<mailto:huang.shengqi...@huawei.com> > 产品与解决方案-交换机与企业网关解决方案架构与设计部 > Products & Solutions-Switch & Enterprise Gateway Solution Architecture > & Design Dept From:Wei Liu To:HUANG SHENGQIANG, > Cc:xen-devel@lists.xenproject.org,Wangjianbing,Wei Liu, > Date:2017-11-06 18:28:58 > Subject:Re: [Xen-devel] Help：Can xen restore several snapshots more > faster at same time？ > > On Mon, Nov 06, 2017 at 04:38:51AM +0000, HUANG SHENGQIANG wrote: > > Dear XEN expert, > > > > I find a blocker issue in my project. Would you please offer us some > > feedback? > > > > The description from my development team: > > we need restore as much as xen snapshot at same times, but we found ‘xl > > restore’ command is work linearly, if we want to restore a new xen > > snapshot, we need to wait for the previous snapshot finish it’s work. We > > try to debug the xl source ,we found the follow information: > > [cid:image001.png@01D356F6.B8EE87E0] > > > > Please don't send pictures. > > > When an snapshot is being restore, we can see another process is blocked. > > We trying to delete the acquire_lock from the source code , then we see all > > the snapshots are being restore at same time, but restore is still very > > slow, one snapshot needs about 25 seconds to finish restore(our > > environment is cpu E52620, 256G memory, SSD hard disk. The snapshot is > > Win7 OS with 2G memory). > > > > There is a lock in xl as you can see in the stack trace. > > > So , does xen have the way to restore more faster when several > > snapshot is restore at same time? Why KVM can restore several > > snapshot fast at same time? (We try the same experiment in KVM, we > > got we can restore about 50+ snapshot in 20S. ) > > > > Part of the toolstack needs to be reworked. You can start by removing > the lock in xl to see what breaks. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
