> > > > > On Mon, Jan 11, 2016 at 04:37:32PM +0530, Ritesh Prajapati wrote: > > > Hi Christophe, > > > > > > Do you know that by adding *"-mno-unaligned-access"* flag into CFLAGS > > > of > > > MakeFile will decrease time to decompress Image through QUIC method in > > > our > > > ARM based A20 SoC board? Does that flag will impact anything from > > > performance perspective? > > > > No I don't know if this will help or not. IF you read through this > > thread, you'll see that this flag has been tested (server-side though), > > and did not seem to make a difference (iirc). > > > > Christophe > > > > The A20 is a Cortex processor (A7 or at least A6) which implements unaligned > access. > Anton is using > (http://lists.freedesktop.org/archives/spice-devel/2015-October/022797.html) > an AST2150 > (http://drivers.softpedia.com/get/GRAPHICS-BOARD/ASPEED/ASPEED-AST2150-Graphics-Driver-601097-for-Server-2008-R2-64-bit.shtml) > which is based on ARM9 which is a V5 > (http://www.arm.com/products/processors/classic/arm9). > See also http://www.heyrick.co.uk/armwiki/Unaligned_data_access. > > I'm trying to use Qemu to reproduce the issue however even using arm926 > (which is a > v5) behave like an arm v6 (do unaligned access). I think this is a > misemulation on Qemu > side (I'm using https://people.debian.org/~aurel32/qemu/armel/ and Qemu from > Fedora 22). > According to http://www.mjmwired.net/kernel/Documentation/arm/mem_alignment I > should > able to get some warning but nothing happen and data readed are not following > v5 behavior. > News on Qemu. It does not support SCTLR_A (aligned check) and SCTRL_U (unaligned access) assuming basically that SCTLR_A is 0 (disable check) and SCTLR_U is 1 (enabled unaligned access). http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0333h/Bgbciiaf.html http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0360f/BABGDHIF.html Frediano _______________________________________________ Spice-devel mailing list Spice-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/spice-devel