FS performace on guest

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Hi,

I am trying to measure filesystem performance on guest OS (using qemu
with kvm) compared to host using bonnie++.

The root file system on guest is mounted on an AHCI device emulated
using sd interface (-drive file=/dev/sdb2,if=sd)

While a sequential character output speed on host (samsung exynos-a15
platform) fetched a speed of 5686K/sec, the guest (versatile
express-a15) speed was 368K/sec. This translates to around 7%
efficiency.

Is this an acceptable speed difference with device emulation ?

Thanks,
Giridhar
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