Forgive me, I'm not a z/VM guy, but I've seen zLinux guests go into some sort of loop condition, consuming z/VM CPU, but the guest is effectively hung. If the guest returns it has lost time for the duration of the loop. I guess this will get reset on re-IPL of the guest though.
I don't know how often this may occur or what the net effect would be over a long period of uptime. If it did occur alot then the clock will "drift"???? Troy, On Mon, 26 Jul 2004 10:07:20 -0400, Alan Altmark <[EMAIL PROTECTED]> wrote: > On Tuesday, 07/13/2004 at 09:00 EST, Adam Thornton > <[EMAIL PROTECTED]> wrote: > > On Mon, 2004-07-12 at 19:43, Ranga Nathan wrote: > > > This is bad news for me. Just got xntpd working for my Linux LPAR and > was > > > thinking about how things will work under z/VM. > > > Does not z/VM run a virtual clock for the guests? > > > > > > Would xntpd not work for the guests? > > > > I've certainly never seen it. None of my guests drift relative to the > > z/VM clock. > > Sorry for the lateness of this response. Guests clocks can't drift from > the VM clock, as their TOD is computed by applying a fixed offset, if any, > to the VM TOD. The only way to change a guest's TOD is via SET CLOCK > instruction or the SET VTOD command. As the VM TOD drifts, so do the TODs > of all the guests, all at the same rate. > > I suppose we could have introduced the concept of "virtual clock drift" > and allow you to configure the rate of drift, just for fun. :-) > > Alan Altmark > Sr. Software Engineer > IBM z/VM Development > > > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > -- ---oOo--- Troyski (Public Email) ......................................... :: Web/PGP Key :: www.troyski.co.uk :: :: MSN [EMAIL PROTECTED] :: YIM troy_muller :: :: ICQ #31206542 :: AIM trymul :: :: GS500E XJ600S :: LCDR Troyski :: ......................................... :: NCOS || CQC || SCI100 || SCI101 :: :: NUR101 || SCC#60975 :: ......................................... \'He who dies with the most toys - wins.\' <Unknown> ---oOo--- ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
