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    Subject[PATCH 4.4 102/158] nfsd: increase DRC cache limit
    Date
    [ Upstream commit 44d8660d3bb0a1c8363ebcb906af2343ea8e15f6 ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 b6eb56d18568..0fa990f08daf 100644
    --- a/fs/nfsd/nfssvc.c
    +++ b/fs/nfsd/nfssvc.c
    @@ -360,7 +360,7 @@ 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;
    --
    2.20.1


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