Re: svn commit: r325108 - head/sys/amd64/vmm/io

2017-10-29 Thread Peter Grehan
Hi Ian, In fact I did check maintainers, and I just now checked it again, and seeing nothing on-point, wrote a really snarky reply. Luckily, before hitting send I realized you wouldn't have said anything unless there was an entry in there, so I checked like 4 more times before I noticed the

Re: svn commit: r325108 - head/sys/amd64/vmm/io

2017-10-29 Thread Ian Lepore
On Sun, 2017-10-29 at 15:15 -0700, Peter Grehan wrote: > > > > > > > >    Improve the performance of the hpet timer in bhyve guests by making the > > >    timer frequency a power of two.  This changes the frequency from 10 to > > >    16.7 MHz (2 ^ 24 HZ).  Using a power of two avoids roundoff

Re: svn commit: r325108 - head/sys/amd64/vmm/io

2017-10-29 Thread Peter Grehan
  Improve the performance of the hpet timer in bhyve guests by making the   timer frequency a power of two.  This changes the frequency from 10 to   16.7 MHz (2 ^ 24 HZ).  Using a power of two avoids roundoff errors when   doing arithmetic in sbintime_t units.   Testing shows this can

Re: svn commit: r325108 - head/sys/amd64/vmm/io

2017-10-29 Thread Ian Lepore
On Sun, 2017-10-29 at 20:50 +, Ian Lepore wrote: > Author: ian > Date: Sun Oct 29 20:50:03 2017 > New Revision: 325108 > URL: https://svnweb.freebsd.org/changeset/base/325108 > > Log: >   Improve the performance of the hpet timer in bhyve guests by making the >   timer frequency a power of

svn commit: r325108 - head/sys/amd64/vmm/io

2017-10-29 Thread Ian Lepore
Author: ian Date: Sun Oct 29 20:50:03 2017 New Revision: 325108 URL: https://svnweb.freebsd.org/changeset/base/325108 Log: Improve the performance of the hpet timer in bhyve guests by making the timer frequency a power of two. This changes the frequency from 10 to 16.7 MHz (2 ^ 24 HZ).