Messages in this thread | | | Date | Mon, 16 Apr 2007 10:37:01 +0200 | From | "Francis Moreau" <> | Subject | Re: [CRYPTO] is it really optimized ? |
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On 4/15/07, Herbert Xu <herbert@gondor.apana.org.au> wrote: > On Sat, Apr 14, 2007 at 11:10:08PM +0200, Francis Moreau wrote: > > > > ok but do you think it's safe to assume that no others parts of the > > kernel will request "aes-foo" ? Remember that the main point is to > > optimize "aes-foo" ? > > What they request is up to the administrator. >
But do you think it's safe to design aes driver that could work only with one kernel user and to rely on administrator config to verify this condition ?
BTW, here are figures I got with 2 different versions of the driver when using tcrypt module. The second being the result with the optimized driver (no key reloading on each block):
normal version: test 4 (128 bit key, 8192 byte blocks): 1 operation in 67991 cycles (8192 bytes)
optimized version: test 4 (128 bit key, 8192 byte blocks): 1 operation in 51783 cycles (8192 bytes)
So the gain is 16000 cycles which seems to worth the change, isn't it ?
thanks -- Francis - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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