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authorJ. Bruce Fields <bfields@redhat.com>2017-09-20 03:51:31 +0300
committerJ. Bruce Fields <bfields@redhat.com>2017-10-04 23:25:01 +0300
commit44d8660d3bb0a1c8363ebcb906af2343ea8e15f6 (patch)
treeae880e4bda7d39b6e4162e05db962b59e85bedc3
parent9542446048e01871fd323cba9a1d468b46cfceea (diff)
downloadlinux-44d8660d3bb0a1c8363ebcb906af2343ea8e15f6.tar.xz
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 <bfields@redhat.com>
-rw-r--r--fs/nfsd/nfssvc.c2
1 files changed, 1 insertions, 1 deletions
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;