On Tue, Aug 01, 2023 at 11:31:37PM -0400, Dusty Mabe wrote: > We ran a kernel bisect and narrowed it down to offending commit af8b04c6: > > ``` > [root@ibm-p8-kvm-03-guest-02 linux]# git bisect good > af8b04c63708fa730c0257084fab91fb2a9cecc4 is the first bad commit > commit af8b04c63708fa730c0257084fab91fb2a9cecc4 > Author: Christoph Hellwig <hch@xxxxxx> > Date: Tue Apr 11 19:14:46 2023 +0200 > > zram: simplify bvec iteration in __zram_make_request > > bio_for_each_segment synthetize bvecs that never cross page boundaries, so > don't duplicate that work in an inner loop. > Any ideas on how to fix the problem? So the interesting cases are: - ppc64 usually uses 64k page sizes - ppc64 is somewhat cache incoherent (compared to say x86) Let me think of this a bit more.
