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nvme: repack struct nvme_ns_head

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ns_id, lba_shift and ms are always accessed for every read/write I/O in
nvme_setup_rw. By grouping these variables into one cacheline we can
safe some cycles.

4k sequential reads:

           baseline   patched
Bandwidth: 1620       1634
IOPs       66345579   66910939

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Daniel Wagner 2023-12-18 17:59:54 +01:00 committed by Keith Busch
parent a1a825ab6a
commit 9639296151
1 changed files with 4 additions and 4 deletions
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8
drivers/nvme/host/nvme.h
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@ -440,21 +440,21 @@ struct nvme_ns_head {
struct list_head list;
struct srcu_struct srcu;
struct nvme_subsystem *subsys;
unsigned ns_id;
struct nvme_ns_ids ids;
struct list_head entry;
struct kref ref;
bool shared;
int instance;
struct nvme_effects_log *effects;
u64 nuse;
unsigned ns_id;
int lba_shift;
u16 ms;
u16 pi_size;
u16 sgs;
u32 sws;
u64 nuse;
u8 pi_type;
u8 guard_type;
u16 sgs;
u32 sws;
#ifdef CONFIG_BLK_DEV_ZONED
u64 zsze;
#endif