Messages in this thread | | | Date | Tue, 31 Oct 2006 08:59:22 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: 2.6.18 is problematic in VMware |
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>> I have observed a strange slowdown with the 2.6.18 kernel in VMware. This >> happened both with the SUSE flavor and with the FC6 installer CD (which I >> am trying right now). In both cases, the kernel "takes its time" after the >> following text strings: >> >> * Checking if this processor honours the WP bit even in supervisor mode... >> Ok. >> * Checking 'hlt' instruction... OK. >> >> What's with that? > > Thanks. It is perhaps the jiffies calibration taking a while because of the > precise timing loop. Are you reasonably confident that it is a regression in > performance over 2.6.17?
Yes. I am not exactly sure if it's something in jiffies calibration (because of the 'WP bit/supervisor' thing too), so maybe I thought it was the newly-introduced SMP alternatives. I gotta check that.
> The boot sequence is pretty complicated, and a lot of > it is difficult / slow to virtualize, so it could just be alternate timing > makes the boot output appear to stall, when in fact the raw time is still about > the same. I will run some experiments.
Booting with 'time' shows that the virtual time increases as usual, i.e.
[ 9.00] checking if wp bit... [15.00] next message here
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