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nfsd: increase DRC cache limit

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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>
This commit is contained in:
J. Bruce Fields 2017-09-19 20:51:31 -04:00
parent 9542446048
commit 44d8660d3b
1 changed files with 1 additions and 1 deletions
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2
fs/nfsd/nfssvc.c
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@ -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;