On Sat, Jan 9, 2016 at 2:15 PM, Dan Williams <dan.j.williams(a)intel.com> wrote:
On Sat, Jan 9, 2016 at 11:39 AM, Tony Luck
> On Sat, Jan 9, 2016 at 9:57 AM, Andy Lutomirski <luto(a)amacapital.net> wrote:
>> On Sat, Jan 9, 2016 at 9:48 AM, Tony Luck <tony.luck(a)gmail.com> wrote:
>> It's the fast string extension, aka Enhanced REP MOV STOS. On CPUs
>> with that feature (and not disabled via MSR), plain ol' rep movs is
>> the fastest way to copy bytes. I think this includes all Intel CPUs
>> from SNB onwards.
> Ah ... very fast at copying .. but currently not machine check recoverable.
Hmm, I assume for the pmem driver I'll want to check at runtime if the
cpu has machine check recovery and fall back to the faster copy if
it's not available?
Shouldn't that logic live in the mcsafe_copy routine itself rather
than being delegated to callers?