b6c46e72f2
As this was done at byte granularity, erasing complete nvram(64K default) took a lot of time. To reduce the number of rtas call per byte write which is expensive, the erase is done at one shot using the nvram_buffer that is initiated during the nvram_init call for RTAS_NVRAM. After this patch there is ~450msec improvement during boot. Default qemu booting does not provide file backed nvram, so every boot there would be full erase of 64K. Before this patch: real 0m2.214s user 0m0.015s sys 0m0.006s real 0m2.222s user 0m0.014s sys 0m0.005s real 0m2.201s user 0m0.010s sys 0m0.005s After this patch: real 0m1.762s user 0m0.014s sys 0m0.006s real 0m1.773s user 0m0.011s sys 0m0.004s real 0m1.754s user 0m0.013s sys 0m0.005s Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> |
||
|---|---|---|
| .. | ||
| Makefile | ||
| envvar.c | ||
| libnvram.code | ||
| libnvram.in | ||
| nvram.c | ||
| nvram.h | ||