From: J. Bruce Fields Date: Wed, 20 Sep 2017 00:51:31 +0000 (-0400) Subject: nfsd: increase DRC cache limit X-Git-Tag: v5.15~9944^2~17 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=44d8660d3bb0a1c8363ebcb906af2343ea8e15f6;p=platform%2Fkernel%2Flinux-starfive.git nfsd: increase DRC cache limit An NFSv4.1+ client negotiates the size of its duplicate reply cache size in the initial CREATE_SESSION request. The server preallocates the memory for the duplicate reply cache to ensure that we'll never fail to record the response to a nonidempotent operation. To prevent a few CREATE_SESSIONs from consuming all of memory we set an upper limit based on nr_free_buffer_pages(). 1/2^10 has been too limiting in practice; 1/2^7 is still less than one percent. Signed-off-by: J. Bruce Fields --- diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 7e3af3e..6bbc717 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -446,7 +446,7 @@ void nfsd_reset_versions(void) */ static void set_max_drc(void) { - #define NFSD_DRC_SIZE_SHIFT 10 + #define NFSD_DRC_SIZE_SHIFT 7 nfsd_drc_max_mem = (nr_free_buffer_pages() >> NFSD_DRC_SIZE_SHIFT) * PAGE_SIZE; nfsd_drc_mem_used = 0;