kern/104624: Sound, mouse and keyboard badly interrupted while I/O (disk, net)

Alexander Best arundel at
Sun Dec 12 12:19:23 UTC 2010

On Sun Dec 12 10, Bruce Cran wrote:
> On Sun, 12 Dec 2010 11:10:11 GMT
> Alexander Best <arundel at> wrote:
> >  i can confirm that a similar issue exists for me running a very
> > recent HEAD snapshot on amd64. when the disk is performing heavy i/o
> > (make -j8 buildworld e.g.) sound starts stuttering and the system
> > goes semi-responsive. mostly the mouse input (usb) is lagging, but
> > sometimes the cursor freezes in it's current position for 10 seconds
> > or so. 
> There was a discussion recently where we noticed this problem appeared
> to occur mostly on systems with Intel Core 2 Duo CPUs. I've seen a
> login paused for over 5 seconds (between typing the password and
> the motd being displayed) due to an "svn up" on my laptop for example.

bulls eye!

CPU: Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz (2394.05-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x6fd  Family = 6  Model = f  Stepping = 13
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant


ps: was this a private discussion or a public one? i'd really like to read up
on this one.

> -- 
> Bruce Cran


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