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Commit a3eb97bd authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Paolo Bonzini
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x86: kvmclock: drop rdtsc_barrier()


Drop unnecessary rdtsc_barrier(), as has been determined empirically,
see 057e6a8c for details.

Noticed by Andy Lutomirski.

Improves clock_gettime() by approximately 15% on
Intel i7-3520M @ 2.90GHz.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent d90e3a35
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......@@ -86,7 +86,6 @@ unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src,
offset = pvclock_get_nsec_offset(src);
ret = src->system_time + offset;
ret_flags = src->flags;
rdtsc_barrier();
*cycles = ret;
*flags = ret_flags;
......
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