> > 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. Frediano _______________________________________________ Spice-devel mailing list Spice-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/spice-devel