On 2022-06-21 17:27:22 [+0200], Jinpu Wang wrote: > Hi, there Hi, > > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > > > > … > > > [ 17.451787][ T1] rtrs_server L2256: Loading module rtrs_server, proto 2.0: (max_chunk_size: 131072 (pure IO 126976, headers 4096) , sess_queue_depth: 512, always_invalidate: 1) > > > [ 17.470894][ T1] swapper: page allocation failure: order:5, mode:0xcc0(GFP_KERNEL), nodemask=(null) > > > > If I read this right, it allocates "512 * 10" chunks of order 5 / 128KiB > > of memory (contiguous memory). And this appears to fail. > > This is either a lot of memory or something that shouldn't be used on > > i386. > It allocates 512 * 128 KiB of memory, which is probably to big for > this VM setup. why 512 * 128KiB? It is: | chunk_pool = mempool_create_page_pool(sess_queue_depth * CHUNK_POOL_SZ, | get_order(max_chunk_size)); with | static int __read_mostly max_chunk_size = DEFAULT_MAX_CHUNK_SIZE; | static int __read_mostly sess_queue_depth = DEFAULT_SESS_QUEUE_DEPTH; | #define CHUNK_POOL_SZ 10 so isn't it (512 * 10) * 128KiB? > Thanks! Sebastian
