Le 02/03/2018 à 18:27, Horia Geantă a écrit :
On 10/6/2017 4:05 PM, Christophe Leroy wrote:
[...]
@@ -1778,6 +1814,36 @@ static int common_nonsnoop_hash(struct talitos_edesc
*edesc,
if (is_sec1 && from_talitos_ptr_len(&desc->ptr[3], true) == 0)
talitos_handle_buggy_has
On 10/6/2017 4:05 PM, Christophe Leroy wrote:
[...]
> @@ -1778,6 +1814,36 @@ static int common_nonsnoop_hash(struct talitos_edesc
> *edesc,
> if (is_sec1 && from_talitos_ptr_len(&desc->ptr[3], true) == 0)
> talitos_handle_buggy_hash(ctx, edesc, &desc->ptr[3]);
>
> + if (i
SEC1 doesn't support S/G in descriptors so for hash operations,
the CPU has to build a buffer containing the buffered block and
the incoming data. This generates a lot of memory copies which
represents more than 50% of CPU time of a md5sum operation as
shown below with a 'perf record'.
|--86.24%--
