Pi 4 has much more throughput in 32-bit modes but the so called experts of Debian decided to abandon it :-(
On 14.07.22 03:52, Wookey wrote: > On 2022-07-01 15:53 +0200, Ard Biesheuvel wrote: >> The 32-bit ARM kernel implements fixups on behalf of user space when >> using LDM/STM or LDRD/STRD instructions on addresses that are not 32-bit >> aligned. >> This feature is one of the remaining impediments to being able to switch >> to 64-bit kernels on 64-bit capable hardware running 32-bit user space, >> so let's implement it for the arm64 compat layer as well. > >> Note to cc'ees: if this is something you would like to see merged, >> please indicate so. This stuff is unlikely to get in if there are no >> users. > Decent 32-bit arm hardware is thin on the ground these days. Debian > still has some but it's getting old and flaky. Being able to build > reliably on 64-bit hardware is important and useful. Unaligned > accesses are much less of a problem than they used to be, but they can > still happen, so having these fixups available is definitely a good > thing. > > Debian runs its 32-bit buildds with alignment fixups turned on. It > looks like the boxes still hit about 1 per day. > > We also do 32 bit builds on 64-bit kernels (in 32-bit userspaces) and > it mostly works. We do have packages that fail on 64-bit kernels and > have to be built on real 32-bit hardware, but I don't know how much of > that would be fixed by this patch. Some, presumably. > > So yes, cheers for this. It is helpful in the real world (or at least > it should be). > > Wookey
