Merge pull request #46 from metaspace/block-v6.15

Block v6.15

Author: ojeda

src/NVMe-driver.md

@@ -24,6 +24,41 @@ The driver is not currently suitable for general use.
    [slides](https://lpc.events/event/16/contributions/1180/attachments/1017/1961/deck.pdf)
    and [video](https://lpc.events/event/16/contributions/1180/attachments/1017/2249/go)
 
+## 6.15 Rebase Performance ([`rnvme-v6.15`](https://git.kernel.org/pub/scm/linux/kernel/git/a.hindborg/linux.git/log/?h=rnvme-v6.15))
+
+### 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
+
+- 40 samples
+- Difference of means modeled with t-distribution
+- P95 confidence intervals
+
+![](rnvme/nvme-v6.15-absolute.svg)
+
+![](rnvme/nvme-v6.15-relative.svg)
+
+The graph shows
+    <math>
+        <mfrac>
+            <mrow>
+                <mi>R</mi>
+                <mo>-</mo>
+                <mi>C</mi>
+            </mrow>
+            <mrow>
+                <mi>C</mi>
+            </mrow>
+        </mfrac>
+    </math>
+where C is IO/s for the C driver and R is IO/s for the Rust driver. Thus, negative
+means the C driver is faster while positive means the Rust driver is faster.
+
 ## 6.14-rc5 Rebase Performance ([`rnvme-v6.14-rc5`](https://git.kernel.org/pub/scm/linux/kernel/git/a.hindborg/linux.git/log/?h=rnvme-v6.14-rc5))
 
 ### Setup

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/20230503090708.2524310-1-nmi@metaspace.dk/)
  - [Subset merged in v6.11-rc1](https://lore.kernel.org/all/20240611114551.228679-1-nmi@metaspace.dk/)
 
+## 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`: