| Message ID | 20170629101952.342-3-kai.heng.feng@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 4ac973dcd02b..bede0ef82079 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -57,7 +57,7 @@ EXPORT_SYMBOL_GPL(nvme_max_retries); static int nvme_char_major; module_param(nvme_char_major, int, 0); -static unsigned long default_ps_max_latency_us = 25000; +static unsigned long default_ps_max_latency_us = 100000; module_param(default_ps_max_latency_us, ulong, 0644); MODULE_PARM_DESC(default_ps_max_latency_us, "max power saving latency for new devices; use PM QOS to change per device");
BugLink: https://bugs.launchpad.net/bugs/1700919 Christoph Hellwig suggests we should to make APST work out of the box. Hence relax the the default max latency to make them able to enter deepest power state on default. Here are id-ctrl excerpts from two high latency NVMes: vid : 0x14a4 ssvid : 0x1b4b mn : CX2-GB1024-Q11 NVMe LITEON 1024GB ps 3 : mp:0.1000W non-operational enlat:5000 exlat:5000 rrt:3 rrl:3 rwt:3 rwl:3 idle_power:- active_power:- ps 4 : mp:0.0100W non-operational enlat:50000 exlat:100000 rrt:4 rrl:4 rwt:4 rwl:4 idle_power:- active_power:- vid : 0x15b7 ssvid : 0x1b4b mn : A400 NVMe SanDisk 512GB ps 3 : mp:0.0500W non-operational enlat:51000 exlat:10000 rrt:0 rrl:0 rwt:0 rwl:0 idle_power:- active_power:- ps 4 : mp:0.0055W non-operational enlat:1000000 exlat:100000 rrt:0 rrl:0 rwt:0 rwl:0 idle_power:- active_power:- Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by: Christoph Hellwig <hch@lst.de> (cherry picked from commit 9947d6a09cd71937dade2fc14640e4843ae19802) Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> --- drivers/nvme/host/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)