X-Git-Url: https://git.decadent.org.uk/gitweb/?p=kernel-news-talk.git;a=blobdiff_plain;f=index.html;h=a21b55937a74646cf9df22bd99ae3aae81b93803;hp=b3cc8440aee544af2befb04d62de4f8c8359f672;hb=52544564a04e423767114258d141c6342cb237f8;hpb=6cfa6de23f7b30ab3babf15904a786cf5f1e6c63

diff --git a/index.html b/index.html
index b3cc844..a21b559 100644
--- a/index.html
+++ b/index.html
@@ -155,7 +155,7 @@
       unnamed temporary file on that filesystem
     </li>
     <li>
-      As with <tt>tmpfile()</tt>, the file disppears on
+      As with <tt>tmpfile()</tt>, the file disappears on
       last <tt>close()</tt>
     </li>
     <li>
@@ -170,27 +170,6 @@
   </ul>
 </div>
 
-<div class="slide">
-  <h1>Lustre filesystem [3.12]</h1>
-  <ul>
-    <li>
-      A distributed filesystem, popular for cluster computing
-      applications
-    </li>
-    <li>
-      Developed out-of-tree since 1999, but now added to Linux staging
-      directory
-    </li>
-    <li>
-      Was included in squeeze but dropped from wheezy as it didn't
-      support Linux 3.2
-    </li>
-    <li>
-      Userland is now missing from Debian
-    </li>
-  </ul>
-</div>
-
 <div class="slide">
   <h1>Network busy-polling [3.11] (1)</h1>
   <p>A conventional network request/response process looks like:</p>
@@ -253,6 +232,27 @@
   </ul>
 </div>
 
+<div class="slide">
+  <h1>Lustre filesystem [3.12]</h1>
+  <ul>
+    <li>
+      A distributed filesystem, popular for cluster computing
+      applications
+    </li>
+    <li>
+      Developed out-of-tree since 1999, but now added to Linux staging
+      directory
+    </li>
+    <li>
+      Was included in squeeze but dropped from wheezy as it didn't
+      support Linux 3.2
+    </li>
+    <li>
+      Userland is now missing from Debian
+    </li>
+  </ul>
+</div>
+
 <div class="slide">
   <h1>Btrfs offline dedupe [3.12]</h1>
   <ul class="incremental">
@@ -284,12 +284,11 @@
       and ebtables
     </li>
     <li>
-      All require a specific kernel module for each type of match
-      and each possible action
+      All limited to single protocol, and need a kernel module for
+      each match type and each action
     </li>
     <li>
-      Userland could only use the four protocol-specific APIs,
-      although the internal netfilter API is more flexible
+      Kernel's internal netfilter API is more flexible
     </li>
     <li>
       nftables exposes more of this flexibility, allowing userland
@@ -299,7 +298,7 @@
       nftables userland tool uses this API and is already packaged
     </li>
     <li>
-      Eventually, the old APIs will be removed and the old userland
+      Eventually, old APIs will be removed and old userland
       tools must be ported to use nftables
     </li>
   </ul>
@@ -343,7 +342,7 @@
       but didn't support kernel running little-endian
     </li>
     <li>
-      Linux 3.13 added little-endian kernel suport, along with new
+      Linux 3.13 added little-endian kernel support, along with new
       userland ELF ABI variant - we call it ppc64el
     </li>
     <li>
@@ -380,6 +379,32 @@
   </ul>
 </div>
 
+<div class="slide">
+  <h1>Multiqueue block devices [3.16]</h1>
+  <ul class="incremental">
+    <li>
+      Each block device has a command queue (possibly shared with
+      other devices)
+    </li>
+    <li>
+      Queue may be partly implemented by hardware (NCQ) or only
+      in software
+    </li>
+    <li>
+      A single queue means initiation is serialised and completion
+      involves IPI - can be bottleneck for fast devices
+    </li>
+    <li>
+      High-end SSDs support multiple queues, but kernel needed changes
+      to use them
+    </li>
+    <li>
+      <tt>mtip32xx</tt> driver now supports multiqueue, but SCSI
+      drivers don't yet - may be backport-able?
+    </li>
+  </ul>
+</div>
+
 <div class="slide">
   <h1>Questions?</h1>
 </div>