From 16bdf3e76fec6ddb44f1fcf221139fb39d225031 Mon Sep 17 00:00:00 2001 From: Igor Pecovnik Date: Sat, 2 Jan 2021 05:23:55 +0000 Subject: [PATCH] kernel: dma: adjust default coherent_pool to 2MiB --- kernel/dma/pool.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -192,13 +192,11 @@ static int __init dma_atomic_pool_init(v int ret = 0; /* - * If coherent_pool was not used on the command line, default the pool - * sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1. + * Always use 2MiB as default pool size. + * See: https://forum.armbian.com/topic/4811-uas-mainline-kernel-coherent-pool-memory-size/ */ if (!atomic_pool_size) { - unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K); - pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES); - atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K); + atomic_pool_size = SZ_2M; } INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);