This is probably caused by mechanism which turns of cache for shared pages. When I add applied following path:

diff --git a/sys/arm/arm/pmap.c b/sys/arm/arm/pmap.c index 390dc3c..d17c0cc 100644 --- a/sys/arm/arm/pmap.c +++ b/sys/arm/arm/pmap.c @@ -1401,6 +1401,8 @@ pmap_fix_cache(struct vm_page *pg, pmap_t pm, vm_offset_t
va) */

TAILQ_FOREACH(pv, &pg->md.pv_list, pv_list) { + if (pv->pv_flags & PVF_EXEC) + return; /* generate a count of the pv_entry uses */ if (pv->pv_flags & PVF_WRITE) { if (pv->pv_pmap == pmap_kernel())

execution time of 'test' program is: mv78100-4# time ./test 5.000u 0.000s 0:05.40 99.8% 40+1324k 0+0io 0pf+0w

and without this path is: mv78100-4# time ./test 295.000u 0.000s 4:56.01 99.7% 40+1322k 0+0io 0pf+0w

I think we need to handle executable pages in different way.

grzesiek