On Tue, Apr 28, 2015 at 09:52:32PM +0200, Boris Brezillon wrote: > > In particular, I'd like to discuss the threaded-irq approach taken in > this driver (other drivers are using tasklets). > The main reason behind this choice is the fact that crypto engines > are quite fast, and I'm worried about the CPU contention that might > happen in case of fully loaded crypto engines (the CPU might spend most > of its time in interrupt context until the crypto queue is emptied). > Using threaded-irq allows preemption of the crypto completion > operation, thus authorizing another thread (with higher priority) to be > scheduled. ITOH, the tasklet approach provide slightly performances (I > don't recall the exact numbers, but Arnaud did some tests). Either approach is fine with me. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
