Hi, On Mon, Apr 23, 2018 at 09:41:04PM +0300, Oleg Babin wrote: > Each SCTP association can have up to 65535 input and output streams. > For each stream type an array of sctp_stream_in or sctp_stream_out > structures is allocated using kmalloc_array() function. This function > allocates physically contiguous memory regions, so this can lead > to allocation of memory regions of very high order, i.e.: > > sizeof(struct sctp_stream_out) == 24, > ((65535 * 24) / 4096) == 383 memory pages (4096 byte per page), > which means 9th memory order. > > This can lead to a memory allocation failures on the systems > under a memory stress. Did you do performance tests while actually using these 65k streams and with 256 (so it gets 2 pages)? This will introduce another deref on each access to an element, but I'm not expecting any impact due to it. Marcelo -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
