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| author | Dave Jiang <dave.jiang@intel.com> | 2021-11-29 10:19:38 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-12-17 21:39:28 +0530 |
| commit | 7930d85535751bc8b05c6731c6b79d874671f13c (patch) | |
| tree | 985eb1029d4206787a3f4b793ca5e5415d1b0c2c /Documentation/ABI | |
| parent | 92452a72ebdf1225aa37690d3648f2af6d0b4fca (diff) | |
| download | linux-stable-7930d85535751bc8b05c6731c6b79d874671f13c.tar.gz linux-stable-7930d85535751bc8b05c6731c6b79d874671f13c.tar.bz2 linux-stable-7930d85535751bc8b05c6731c6b79d874671f13c.zip | |
dmaengine: idxd: add knob for enqcmds retries
Add a sysfs knob to allow tuning of retries for the kernel ENQCMDS
descriptor submission. While on host, it is not as likely that ENQCMDS
return busy during normal operations due to the driver controlling the
number of descriptors allocated for submission. However, when the driver is
operating as a guest driver, the chance of retry goes up significantly due
to sharing a wq with multiple VMs. A default value is provided with the
system admin being able to tune the value on a per WQ basis.
Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/163820629464.2702134.7577370098568297574.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-driver-dma-idxd | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation/ABI/stable/sysfs-driver-dma-idxd index df4afbccf037..4d3a23eb05b9 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -220,6 +220,13 @@ Contact: dmaengine@vger.kernel.org Description: Show the current number of entries in this WQ if WQ Occupancy Support bit WQ capabilities is 1. +What: /sys/bus/dsa/devices/wq<m>.<n>/enqcmds_retries +Date Oct 29, 2021 +KernelVersion: 5.17.0 +Contact: dmaengine@vger.kernel.org +Description: Indicate the number of retires for an enqcmds submission on a shared wq. + A max value to set attribute is capped at 64. + What: /sys/bus/dsa/devices/engine<m>.<n>/group_id Date: Oct 25, 2019 KernelVersion: 5.6.0 |