The regression does not exist in the way that I suspected - it's just
that the default for 9p mount option "msize=4096" causes the bad
performance when reading large files on the guest.
I was mislead because...
a) mount -o remount,msize=...,...
seems to work (with mount reporting the changed
Hi all,
I have been using 9p mounts on guests for quite some time, and enjoyed
their nice performance.
But not anymore: I noticed that just "dd"-ing large plain files to /dev/zero
on the guest system became very slow, even if the data is completely
in the cache of the host. The rate maxes at ~ 3
