blob: a3e56a4cbc5902ecd770db42bccd8c066347d075 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Steven Barrett <steven@liquorix.net>
Date: Sat, 21 May 2022 15:15:09 -0500
Subject: [PATCH] ZEN: dm-crypt: Disable workqueues for crypto operations
Queueing in dm-crypt for crypto operations reduces performance on modern
systems. As discussed in an article from Cloudflare, they discovered
that queuing was introduced because the crypto subsystem used to be
synchronous. Since it's now asynchronous, we get double queueing when
using the subsystem through dm-crypt. This is obviously undesirable and
reduces throughput and increases latency.
Disable queueing when using our Zen Interactive configuration.
Fixes: https://github.com/zen-kernel/zen-kernel/issues/282
---
drivers/md/dm-crypt.c | 5 +++++
init/Kconfig | 1 +
2 files changed, 6 insertions(+)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index fb80539865d7c0499c39dab9c652348d1164af81..11031338d95f7ef546e3ed68f359bf956583c1be 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -3137,6 +3137,11 @@ static int crypt_ctr_optional(struct dm_target *ti, unsigned int argc, char **ar
}
}
+#ifdef CONFIG_ZEN_INTERACTIVE
+ set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
+ set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
+#endif
+
return 0;
}
diff --git a/init/Kconfig b/init/Kconfig
index ecfe83ad567b94696de585082cdea4168fef2db4..dd6432fbec07c238154830db9aa76c9d514ddcee 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -120,6 +120,7 @@ config ZEN_INTERACTIVE
--- Block Layer ----------------------------------------
Default scheduler.........: mq-deadline -> bfq
+ DM-Crypt Workqueues.......: on -> off
--- Virtual Memory Subsystem ---------------------------
|