One does have to question if the fix(es) will cause additional overhead, no matter what platform the system resides on.
On Thu, Jan 4, 2018 at 9:14 AM, John McKown <[email protected]> wrote: > On Thu, Jan 4, 2018 at 7:36 AM, Guest, Darren < > [email protected]> > wrote: > > > Hi, > > > > Not sure if people have seen that attached article or heard of the > 'intel' > > chip issues from elsewhere: > > https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/ > > > > The 'fix' for meltdown (at least) is apparently to change the Linux > kernel > > which will potentially affect performance. I'm pretty sure that zSeries > > isn't affected by the issue (is it?), but if the Linux Kernel is changed, > > are we likely to see a performance hit on Linux running on zSeries as > well > > (even though we don't need the fix)? > > > > Best case scenario, can I tell my management that these won't affect > Linux > > on z? > > > > I am not any kind of Linux internals wizzard. But this exploit takes > advantage of a _HARDWARD_ flaw in the Intel CPU. Linux on z does not run on > an _Intel_ chip. The story, that I've read at least, specifically mentions > that most AMD chips are not affected; nor are ARM chips. So why would the > z chip? Of course, management usually being composed of hardware illiterate > "liberal arts" majors, perhaps it would be a good idea for IBM to > explicitly announce to the work that this flaw does not affect the IBMZ > machines. > > > > > > > > > Cheers, > > > > Darren > > > > Darren Guest > > > > First Aider > > Senior Fire Executive > > Senior Systems Engineer > > Mainframe OS > > Global Technology Services, Experian UK > > > > -- > I have a theory that it's impossible to prove anything, but I can't prove > it. > > Maranatha! <>< > John McKown > > ---------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > -- ><((((º>`·.¸¸´¯`·.¸.·´¯`·...¸>(((º> .·´¯`·.><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º> <>< Go fishing ><> ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
