[SLOF] [PATCH v2] rtas-nvram: optimize erase

[Nikunj A Dadhania]

Alexey Kardashevskiy <aik at ozlabs.ru> writes:

> On 09/05/16 21:13, Nikunj A Dadhania wrote:
>> 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
>
> Thanks, applied.
>
> btw have you received a mail from the patchworks that the patch status has 
> changed? If so, I would prefer not to generate more noise with these 
> "applied" messages in the maillist if possible.

No, havent received any message.

Regards,
Nikunj