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<geist>
around the freenode collapse i went ahead and fully switched to irccloud and i've been pretty happy with
<geist>
but it's not free, though it's also not expensive
<clever>
i already had an old gentoo box dedicated to just running irssi under screen
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<froggey>
does anyone know how much overhead running with alignment checking enabled has on x86? (ie EFLAGS.AC=1)
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<zid>
I am assuming none.. unless you take the exception
<moon-child>
froggey: based purely on the fact that e.g. movaps and movups are the same speed for aligned data, I would assume that it _can_ be free. Whether they actually bothered to make it so, I have no idea
<zid>
yea, conceptually it's simple
<zid>
check the bottom 2 bits of the address, signal based on some and gate or whatever
<zid>
so if it's slow.. they're being mean
<moon-child>
zid: well, you have to roll back the state to the point where the fault happens. Cuz superscalar. Already have to do that for e.g. bad perms, bad decode, branch mispred, etc, so the infra is there for it, but this adds another case you have to handle; they may not have considered it worhtwhile
<zid>
the fault being slow is fine
<moon-child>
yes, my point is you have to keep enough state around to roll back when you perform the fault
<gog>
seems like more hassle than just doing the unaligned access
<froggey>
yeah, I was wondering about normal operation. I don't care if the fault is slow
<zid>
you can't enable it on windows, windows is naughty
<zid>
and dies
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<Qubasa>
Does someone here know how to get "perf kvm" to read and apply my dwarf/ELF symbols?
<Qubasa>
I tried "nm kernel.elf > kernel.map" and then "sudo perf kvm --guestkallsyms=kernel.map record"
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<geist>
good question. Honestly i've never used the 'kvm' command, which i guess is a wrapper around libvirt or whatnot?
<geist>
I always drive qemu directly
<gog>
don't drink and qemu
<klange>
I think it's just a wrapper around qemu directly that ensures -enable-kvm