Il 12/06/2014 18:02, Vincent JARDIN ha scritto:
* Get all the required parts outside QEMU packaged in major distros, or
absorbed into QEMU
Redhat did disable it. why? it is there in QEMU.
We don't ship everything that is part of QEMU, just like we selectively
disable many drivers in Linux.
Markus especially referred to parts *outside* QEMU: the server, the uio
driver, etc. These out-of-tree, non-packaged parts of ivshmem are one
of the reasons why Red Hat has disabled ivshmem in RHEL7.
He also listed many others. Basically for parts of QEMU that are not of
high quality, we either fix them (this is for example what we did for
qcow2) or disable them. Not just ivshmem suffered this fate, for
example many network cards, sound cards, SCSI storage adapters.
Now, vhost-user is in the process of being merged for 2.1. Compared to
the DPDK solution:
* it doesn't require hugetlbfs (which only enabled shared memory by
chance in older QEMU releases, that was never documented)
* it doesn't require ivshmem (it does require shared memory, which will
also be added to 2.1)
* it doesn't require the kernel driver from the DPDK sample
* it is not just shared memory, but also defines an interface to use it
(another of Markus's points)
vhost-user is superior, and it is superior because it has been designed
from the get-go through cooperation of all interested parties (namely
QEMU and snabbswitch).
Paolo
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