Frédéric Konrad <konrad.frede...@yahoo.fr> writes: > Hi Jim, > > I think Alex and Paolo worked on an mttcg/icount issue. > Not sure if its related or not.
If you are running a tree post-MTTCG merge you will need to add Paolo's patches: Subject: [PATCH 0/6] tcg: fix icount super slowdown Date: Fri, 3 Mar 2017 14:11:08 +0100 Message-Id: <20170303131113.25898-1-pbonz...@redhat.com> > > Fred > > On 03/03/2017 08:38 PM, Nutaro, James J. wrote: >> My original problem seems to stem from something that changed in the way >> that device emulation and instruction execution interact (I'm guessing). To >> reproduce the issue, I started a linux image with >> >> qemu-system-i386 -rtc clock=vm -monitor none -icount 1,sleep=off jack.img >> >> After booting, I run >> >> ping localhost >> >> The first round trip time reports look reasonable, being in the millisecond >> to sub-millisecond range. These occur while the emulator is running slower >> than real time. >> >> After a bit, the emulator speeds up (skipping over idle periods during I/O?) >> and the round trip times jump to hundreds of milliseconds, which I had not >> expected. >> >> If you want to try this experiment yourself, you can get the disk image that >> I used from here: >> >> http://www.ornl.gov/~1qn/qemu-images/jack.img >> >> >> Jim >> -- Alex Bennée
