Re: I/O performance of VirtIO

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On 10/26/2009 10:12 AM, Jan Kiszka wrote:
No.  Dedicated I/O threads provide parallelism.  All latency needs is to
have SIGIO sent on all file descriptors (or rather, in qemu-kvm with
irqchip, to have all file descriptors in the poll() call).

Jan, does slirp add new connections to the select set?

It should do so in slirp_select_fill (it iterates over all TCP&UDP
sockets of all instances). I think without doing this, slirp wouldn't
receive a single bit at all (no activity without FD_ISSET).

Yes, so it seems from the code. But something is missing if you get better performance with -no-kvm-irqchip. Perhaps timers are off.

--
error compiling committee.c: too many arguments to function

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