Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c5747758 authored by Panchajanya1999's avatar Panchajanya1999 Committed by Pranav Vashi
Browse files

cfq-iosched: Apply RedHat suggested tunings for fast storage 

Apply tunings from redHat[1] for faster storage.

[1]: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/pdf/performance_tuning_guide/red_hat_enterprise_linux-7-performance_tuning_guide-en-us.pdf


(Section 8.4.5.1)

Change-Id: Ie8e3f7898d661362212d3eac5fe854362048ce94
Signed-off-by: default avatarPanchajanya1999 <panchajanya@azure-dev.live>
Signed-off-by: default avatarCyber Knight <cyberknight755@gmail.com>
Signed-off-by: default avatarPranav Vashi <neobuddy89@gmail.com>
parent 8ff076d3

block/cfq-iosched.c

+4 −4
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ 
 * tunables

 */

/* max queue in one round of service */

static const int cfq_quantum = 8;

static const int cfq_quantum = 64;

static const u64 cfq_fifo_expire[2] = { NSEC_PER_SEC / 4, NSEC_PER_SEC / 8 };

/* maximum backwards seek, in KiB */

static const int cfq_back_max = 16 * 1024;
@@ -33,7 +33,7 @@ static const u64 cfq_slice_sync = NSEC_PER_SEC / 10; 
static u64 cfq_slice_async = NSEC_PER_SEC / 25;

static const int cfq_slice_async_rq = 2;

static u64 cfq_slice_idle = NSEC_PER_SEC / 125;

static u64 cfq_group_idle = NSEC_PER_SEC / 125;

static u64 cfq_group_idle = 1;

static const u64 cfq_target_latency = (u64)NSEC_PER_SEC * 3/10; /* 300 ms */

static const int cfq_hist_divisor = 4;
@@ -4791,7 +4791,7 @@ SHOW_FUNCTION(cfq_fifo_expire_async_show, cfqd->cfq_fifo_expire[0], 1); 
SHOW_FUNCTION(cfq_back_seek_max_show, cfqd->cfq_back_max, 0);

SHOW_FUNCTION(cfq_back_seek_penalty_show, cfqd->cfq_back_penalty, 0);

SHOW_FUNCTION(cfq_slice_idle_show, cfqd->cfq_slice_idle, 1);

SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 1);

SHOW_FUNCTION(cfq_group_idle_show, cfqd->cfq_group_idle, 0);

SHOW_FUNCTION(cfq_slice_sync_show, cfqd->cfq_slice[1], 1);

SHOW_FUNCTION(cfq_slice_async_show, cfqd->cfq_slice[0], 1);

SHOW_FUNCTION(cfq_slice_async_rq_show, cfqd->cfq_slice_async_rq, 0);
@@ -4840,7 +4840,7 @@ STORE_FUNCTION(cfq_back_seek_max_store, &cfqd->cfq_back_max, 0, UINT_MAX, 0); 
STORE_FUNCTION(cfq_back_seek_penalty_store, &cfqd->cfq_back_penalty, 1,

		UINT_MAX, 0);

STORE_FUNCTION(cfq_slice_idle_store, &cfqd->cfq_slice_idle, 0, UINT_MAX, 1);

STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 1);

STORE_FUNCTION(cfq_group_idle_store, &cfqd->cfq_group_idle, 0, UINT_MAX, 0);

STORE_FUNCTION(cfq_slice_sync_store, &cfqd->cfq_slice[1], 1, UINT_MAX, 1);

STORE_FUNCTION(cfq_slice_async_store, &cfqd->cfq_slice[0], 1, UINT_MAX, 1);

STORE_FUNCTION(cfq_slice_async_rq_store, &cfqd->cfq_slice_async_rq, 1,