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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] Greate difference of disk I/O performance for guest on Qemu-2.30 of CentOS. |
| Date: | Fri, 19 Jun 2015 10:37:23 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 19/06/2015 03:03, cauchy-love wrote: > I have tried your qemu cammand line but got no luck (the embedded os > have no virtio support but this is not the problem i think). The > problem probably lies in the host kernel version as it is the only > difference for my tests. I traced the guest kernel and found the ATA > drivers always used non-DMA mode (CentOS 7 and CentOS 6.5 are the > same at this point). You can use perf to see what's the difference. Perhaps CentOS 6.5 used ext4 and 7 uses XFS? Though in general XFS is the faster one... Paolo
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