| Message ID | 20241107183054.2443218-1-csander@purestorage.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | [net-next,v2,1/2] mlx5/core: relax memory barrier in eq_update_ci() | expand |
> From: Caleb Sander Mateos <csander@purestorage.com> > Sent: Friday, November 8, 2024 12:01 AM > > The memory barrier in eq_update_ci() after the doorbell write is a significant > hot spot in mlx5_eq_comp_int(). Under heavy TCP load, we see 3% of CPU > time spent on the mfence instruction. > > 98df6d5b877c ("net/mlx5: A write memory barrier is sufficient in EQ ci > update") already relaxed the full memory barrier to just a write barrier in > mlx5_eq_update_ci(), which duplicates eq_update_ci(). So replace mb() with > wmb() in eq_update_ci() too. > > On strongly ordered architectures, no barrier is actually needed because the > MMIO writes to the doorbell register are guaranteed to appear to the device in > the order they were made. However, the kernel's ordered MMIO primitive > writel() lacks a convenient big-endian interface. > Therefore, we opt to stick with __raw_writel() + a barrier. > > Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> > --- > v2: keep memory barrier instead of using ordered writel() > > drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h > b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h > index 4b7f7131c560..b1edc71ffc6d 100644 > --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h > +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h > @@ -70,11 +70,11 @@ static inline void eq_update_ci(struct mlx5_eq *eq, int > arm) > __be32 __iomem *addr = eq->doorbell + (arm ? 0 : 2); > u32 val = (eq->cons_index & 0xffffff) | (eq->eqn << 24); > > __raw_writel((__force u32)cpu_to_be32(val), addr); > /* We still want ordering, just not swabbing, so add a barrier */ > - mb(); > + wmb(); > } > > int mlx5_eq_table_init(struct mlx5_core_dev *dev); void > mlx5_eq_table_cleanup(struct mlx5_core_dev *dev); int > mlx5_eq_table_create(struct mlx5_core_dev *dev); > -- > 2.45.2 Reviewed-by: Parav Pandit <parav@nvidia.com>
On 08/11/2024 12:46, Parav Pandit wrote: > >> From: Caleb Sander Mateos <csander@purestorage.com> >> Sent: Friday, November 8, 2024 12:01 AM >> >> The memory barrier in eq_update_ci() after the doorbell write is a significant >> hot spot in mlx5_eq_comp_int(). Under heavy TCP load, we see 3% of CPU >> time spent on the mfence instruction. >> >> 98df6d5b877c ("net/mlx5: A write memory barrier is sufficient in EQ ci >> update") already relaxed the full memory barrier to just a write barrier in >> mlx5_eq_update_ci(), which duplicates eq_update_ci(). So replace mb() with >> wmb() in eq_update_ci() too. >> >> On strongly ordered architectures, no barrier is actually needed because the >> MMIO writes to the doorbell register are guaranteed to appear to the device in >> the order they were made. However, the kernel's ordered MMIO primitive >> writel() lacks a convenient big-endian interface. >> Therefore, we opt to stick with __raw_writel() + a barrier. >> >> Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> >> --- >> v2: keep memory barrier instead of using ordered writel() >> >> drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h >> b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h >> index 4b7f7131c560..b1edc71ffc6d 100644 >> --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h >> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h >> @@ -70,11 +70,11 @@ static inline void eq_update_ci(struct mlx5_eq *eq, int >> arm) >> __be32 __iomem *addr = eq->doorbell + (arm ? 0 : 2); >> u32 val = (eq->cons_index & 0xffffff) | (eq->eqn << 24); >> >> __raw_writel((__force u32)cpu_to_be32(val), addr); >> /* We still want ordering, just not swabbing, so add a barrier */ >> - mb(); >> + wmb(); >> } >> >> int mlx5_eq_table_init(struct mlx5_core_dev *dev); void >> mlx5_eq_table_cleanup(struct mlx5_core_dev *dev); int >> mlx5_eq_table_create(struct mlx5_core_dev *dev); >> -- >> 2.45.2 > > Reviewed-by: Parav Pandit <parav@nvidia.com> > Acked-by: Tariq Toukan <tariqt@nvidia.com>
On Thu, 7 Nov 2024 11:30:51 -0700 Caleb Sander Mateos wrote: > The memory barrier in eq_update_ci() after the doorbell write is a > significant hot spot in mlx5_eq_comp_int(). Under heavy TCP load, we see > 3% of CPU time spent on the mfence instruction. Applied, thanks. In the future please avoid sending patches in reply to older version.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h index 4b7f7131c560..b1edc71ffc6d 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h @@ -70,11 +70,11 @@ static inline void eq_update_ci(struct mlx5_eq *eq, int arm) __be32 __iomem *addr = eq->doorbell + (arm ? 0 : 2); u32 val = (eq->cons_index & 0xffffff) | (eq->eqn << 24); __raw_writel((__force u32)cpu_to_be32(val), addr); /* We still want ordering, just not swabbing, so add a barrier */ - mb(); + wmb(); } int mlx5_eq_table_init(struct mlx5_core_dev *dev); void mlx5_eq_table_cleanup(struct mlx5_core_dev *dev); int mlx5_eq_table_create(struct mlx5_core_dev *dev);
The memory barrier in eq_update_ci() after the doorbell write is a significant hot spot in mlx5_eq_comp_int(). Under heavy TCP load, we see 3% of CPU time spent on the mfence instruction. 98df6d5b877c ("net/mlx5: A write memory barrier is sufficient in EQ ci update") already relaxed the full memory barrier to just a write barrier in mlx5_eq_update_ci(), which duplicates eq_update_ci(). So replace mb() with wmb() in eq_update_ci() too. On strongly ordered architectures, no barrier is actually needed because the MMIO writes to the doorbell register are guaranteed to appear to the device in the order they were made. However, the kernel's ordered MMIO primitive writel() lacks a convenient big-endian interface. Therefore, we opt to stick with __raw_writel() + a barrier. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> --- v2: keep memory barrier instead of using ordered writel() drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)