rnull: add benchmark results for v6.15

Signed-off-by: Andreas Hindborg <[email protected]>

Author: Andreas Hindborg

src/Null-Block-Driver.md

@@ -50,6 +50,7 @@ Implemented features:
  - Multiple devices
  - Dynamic device creation/destruction
  - Queue count configuration
+ - Per node hctx
 
 Features available in the C `null_blk` driver that are currently not implemented
 in this work:
@@ -58,7 +59,6 @@ in this work:
  - Discard operation support
  - Cache emulation
  - Bandwidth throttling
- - Per node hctx
  - IO scheduler configuration
  - Blocking submission mode
  - Shared tags configuration (for >1 device)
@@ -73,6 +73,38 @@ in this work:
  - [Mailing List Post](https://lore.kernel.org/all/[email protected]/)
  - [Subset merged in v6.11-rc1](https://lore.kernel.org/all/[email protected]/)
 
+## 6.15 Rebase ([`rnull-v6.15`](https://git.kernel.org/pub/scm/linux/kernel/git/a.hindborg/linux.git/log/?h=rnull-v6.15))
+
+Changes from `rnull-v6.14`:
+
+ - No changes
+
+### Performance
+
+#### Setup
+
+ - AMD Ryzen 5 7600
+ - 32 GB 4800 MT/s DDR5 on one channel
+ - 1x Samsung 990 Pro 1TB (PCIe 4.0 x4 16 GT/S)
+ - NixOS 24.11
+
+#### Results
+
+- Plot shows `(mean_iops_r - mean_iops_c) / mean_iops_c`
+- 40 samples for each configuration
+- Difference of means modeled with t-distribution
+- P95 confidence intervals
+
+![](rnull/rnull-v6.15.svg)
+
+
+##### Sample Distribution
+
+- C left bounded by blue line.
+- Rust right bounded by orange line.
+
+![](rnull/rnull-v6.15-density.svg)
+
 ## 6.14-rc5 Rebase ([`rnull-v6.14-rc5`](https://git.kernel.org/pub/scm/linux/kernel/git/a.hindborg/linux.git/log/?h=rnull-v6.14-rc5))
 
 Changes from `rnull-v6.13`: