QEMU's slow dnf makecache process

[Joe (Jun-Yan) Chen]

Dear QEMU development Team,

I am using qemu(aarch64, TCG) on X86 server as Kojibuilder(buildfarm), however I found that whenever QEMU download something in new buildroot, it will costs a lot of time in "$dnf makecache" process,(last 7minutes after metadata had been downloaded). I tested that the netio and diskio are not the bottleneck, but the CPU usage is always 100% during this period, and I straced this process(dnf makecache), there's lots of "read()" "write()" "map()" functions had been called.

Is there any method to speed up the process of "$dnf makecache" after the metadata has been downloaded?

Or am I missing something?

I am looking forward your expertise.

Joe

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