Bugs item #1998355, was opened at 2008-06-20 03:11 Message generated for change (Comment added) made by thekozmo You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=1998355&group_id=180599
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Joshua Rosen (bjrosen) Assigned to: Nobody/Anonymous (nobody) Summary: IO Performance Initial Comment: Is there any way of mapping a host's directory into a KVM VM similar to VMware's Shared Folder feature? I've been benchmarking the performance of NCVerilog under various VMs. The performance of KVM when using a virtual disk is excellent, in fact it's better than VMware Server or VMware Workstation, however if you use an NFS mounted host directory the performance is unspeakably awful. An NFS mounted directory under VMware Server 2.0 (Beta 2) is also slow but it's still significantly better than KVM. Using a Shared Folder with VMware Workstation eliminates the IO bottleneck, the performance there is about the same as accessing a virtual disk. The system that I did these benchmarks on is a 3GHz Core2 with 8G of RAM. VMware was running under CentOS5.1 with a 2.6.23.7 kernel. KVM is running on Fedora 9 with a 2.6.25.xx kernel. The Verilog simulation times for my test suite are as follows, Native 06:34 VM Server 2, virtual disk 08:05 VM Server 2, NFS 18:37 VM Workstation, shared folder 08:14 KVM, Virtual disk 07:42 KVM, NFS 38:36 ---------------------------------------------------------------------- Comment By: Dor Laor (thekozmo) Date: 2008-06-21 00:58 Message: Logged In: YES user_id=2124464 Originator: NO Did you use virtio nic when testing kvm with NFS? If not, do try, it should boost your performance. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=1998355&group_id=180599 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
