Re: [PATCH 2/2] scsi: core: avoid to pre-allocate big chunk for sg list

[Bart Van Assche]

On Tue, 2019-04-23 at 18:32 +0800, Ming Lei wrote:
>  #define  SCSI_INLINE_PROT_SG_CNT  1
>  
> +#define  SCSI_INLINE_SG_CNT  2

So this patch inserts one kmalloc() and one kfree() call in the hot path
for every SCSI request with more than two elements in its scatterlist? Isn't
"2" too low? Or in other words, what is the performance impact of this patch
for a real-world workload?

Thanks,

Bart.