Hi Gabe and Ali, Thanks for the leads! I'd love to get my hands on the x86-specific patches if you can find them. I have been booting to shell with m5term so far, and you're right, I need to disable the init services. Is it safe to disable all of them, or all under certain runlevels? Thanks, Joel
On Wed, Jun 9, 2010 at 10:00 PM, Ali Saidi <[email protected]> wrote: > Hi Joel, > > The patches do two things to improve the simulation speed. First, they > calculate what loopsperjiffy would be given the processor frequency and > write that value into the global variable. You can get around this by just > passing the lpj=XXXXXX boot argument to the kernel, so this change isn't > particularly needed anymore. The other thing they do is re-write the __delay > to use an pseudo instruction (a made up opcode that does simulator specific > functionality) that encodes how long the processor should sleep for. Thus > when udelay() and nsdelay() are used in the kernel, the cpu model can just > jump to the right time (either the end of the delay or an interrupt). > > The various other patches provide additional pseudo instructions, but none > of them relate to performance. > > Ali > > On Jun 9, 2010, at 4:09 PM, Joel Hestness wrote: > > > Hi everyone, > > I am interested in helping develop X86_FS boot up and testing. > > Under X86_FS, I have been able to boot a couple different versions of > the Linux kernel (v2.6.22.9 and v2.6.28.4), but the bring up requires more > than 12 hours of simulation time. I am hoping to reduce the boot time to > make it more usable. > > I recall that the M5 patches for alpha-linux play some tricks to speed > bootup, so I tried building an x86 kernel v2.6.27 with the patches. It > looks like many of the patches are specific to ALPHA, so (maybe > unsurprisingly) I encountered errors quickly in the build. > > I am wondering if anyone is currently working on this, or if I could > get some pointers on where to dig in. > > Thank you, > > Joel > > > > > > -- > > Joel Hestness > > PhD Student, Computer Architecture > > Dept. of Computer Science, University of Texas - Austin > > http://www.cs.utexas.edu/~hestness > > _______________________________________________ > > m5-dev mailing list > > [email protected] > > http://m5sim.org/mailman/listinfo/m5-dev > > _______________________________________________ > m5-dev mailing list > [email protected] > http://m5sim.org/mailman/listinfo/m5-dev > -- Joel Hestness PhD Student, Computer Architecture Dept. of Computer Science, University of Texas - Austin http://www.cs.utexas.edu/~hestness
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