> -----Original Message----- > From: Phillips Kim-R1AAHA > Sent: Thursday, February 07, 2013 7:03 AM > To: Garg Vakul-B16394 > Cc: linux-crypto@xxxxxxxxxxxxxxx; Herbert Xu; David S. Miller; Liu > Shengzhou-B36685; Porosanu Alexandru-B06830; linux-kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] crypto: caam - set RDB bit in security configuration > register > > On Wed, 6 Feb 2013 17:17:46 +0530 > Vakul Garg <vakul@xxxxxxxxxxxxx> wrote: > > > This change is required for post SEC-5.0 devices which have RNG4. > > Setting RDB > > wrap your commit message text to 75 chars Ok > > > in security configuration register allows CAAM to use the "Random Data > Buffer" > > to be filled by a single request. The Random Data Buffer is large > > enough for ten packets to get their IVs from a single request. If the > > Random Data Buffer is not enabled, then each IV causes a separate > > request, and RNG4 hardware cannot keep up resulting in lower IPSEC > throughput. > > Linux kernel IPSec or another IPSEC stack? how much lower? We measured USDPAA IPSEC throughput to be 1.9 times better on T4240 with this change. > > > + if (of_device_is_compatible(nprop, "fsl,sec-v5.0")) > > + setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE); > > + > > this belongs further down - at the end of the RNG4 initialization > section. Ok > > Kim -- 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
