On 03/08/2010 03:46 AM, Bernhard Schmidt wrote:
Hi, sorry for this pretty generic question, I did not find any real pros and cons on the net anywhere, but I might just have missed them. In a pure x86_64 environment (~2.6.32 vanilla kernel, 0.12.3 qemu-kvm), is enabling linux-aio in KVM a good idea?
Yes.
What are the advantages/disadvantages?
It's faster.
Are there any potential pitfalls?
It won't work well unless running on a block device (partition or LVM).
The reason I'm asking is that there has been some traffic on the list about it, so it seems to be something people want to get working. qemu-kvm in Ubuntu Lucid is currently not compiled with that option. I've made a local version with aio and it seems to work fine (and performs a bit better at first glance). Is there any reason one should not compile that feature by default?
Not to my knowledge.
Does it do anything if not explicitly run with aio=native?
IIUC, no. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
