On Fri, Sep 18, 2015 at 02:27:12PM +0000, Porosanu Alexandru wrote:
> 
> Well, the HW has less than the whole RAM for backlogging requests, it has the 
> # of available backlogging requests slots.
> Then it will start dropping, just like in the out-of-mem case.

OK I think that's where our misunderstanding is.  For a backlogged
request you do not give it to the hardware immediately.  In fact
a request should only be backlogged when the hardware queue is
completely full.  It should stay in a software queue until the
hardware has space for it.  When that happens you move it onto
the hardware queue and invoke the completion function with err
set to -EINPROGRESS.  This tells the caller to enqueue that it
may enqueue more requests.

Cheers,
-- 
Email: Herbert Xu <herb...@gondor.apana.org.au>
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 majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to