From 44d8660d3bb0a1c8363ebcb906af2343ea8e15f6 Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Tue, 19 Sep 2017 20:51:31 -0400 Subject: [PATCH] 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 --- fs/nfsd/nfssvc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 7e3af3ef0917..6bbc717f40f2 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; -- 2.45.2