45 lines
1.5 KiB
Diff
45 lines
1.5 KiB
Diff
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From a8a0d4b9f356610babe5b884500799310fe6dcdd Mon Sep 17 00:00:00 2001
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From: Steven Barrett <steven@liquorix.net>
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Date: Sat, 21 May 2022 15:15:09 -0500
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Subject: ZEN: INTERACTIVE: dm-crypt: Disable workqueues for crypto ops
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Queueing in dm-crypt for crypto operations reduces performance on modern
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systems. As discussed in an article from Cloudflare, they discovered
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that queuing was introduced because the crypto subsystem used to be
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synchronous. Since it's now asynchronous, we get double queueing when
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using the subsystem through dm-crypt. This is obviously undesirable and
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reduces throughput and increases latency.
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Disable queueing when using our Zen Interactive configuration.
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Fixes: https://github.com/zen-kernel/zen-kernel/issues/282
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---
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drivers/md/dm-crypt.c | 5 +++++
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init/Kconfig | 1 +
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2 files changed, 6 insertions(+)
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--- a/drivers/md/dm-crypt.c
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+++ b/drivers/md/dm-crypt.c
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@@ -3310,6 +3310,11 @@ static int crypt_ctr(struct dm_target *t
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goto bad;
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}
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+#ifdef CONFIG_ZEN_INTERACTIVE
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+ set_bit(DM_CRYPT_NO_READ_WORKQUEUE, &cc->flags);
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+ set_bit(DM_CRYPT_NO_WRITE_WORKQUEUE, &cc->flags);
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+#endif
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+
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ret = crypt_ctr_cipher(ti, argv[0], argv[1]);
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if (ret < 0)
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goto bad;
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -144,6 +144,7 @@ config ZEN_INTERACTIVE
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Default scheduler for SQ..: mq-deadline -> bfq
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Default scheduler for MQ..: none -> kyber
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+ DM-Crypt workqueues.......: yes -> no
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--- Virtual Memory Subsystem ---------------------------
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