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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [PATCH v4 18/29] hostmem: add file-based HostMemoryBackend |
| Date: | Tue, 10 Jun 2014 13:12:04 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
Il 10/06/2014 11:59, Michael S. Tsirkin ha scritto:
> >What's the point compared to memory-backend-ram? > > That you can use shared memory, for example together with vhost-user. I don't think it's a good idea until THP supports shared memory.
Why? For example it would be useful for testing on machines that you don't have root for, and that do not have a hugetlbfs mount point. For example you could run the test case from the vhost-user's patches.
THP is not a magic wand and you can get slowness from memory fragmentation at any time. We should not limit ourselves due to kernel bugs.
Paolo
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