linux-kernel - [PATCH] x86/xen/time: Reduce Xen timer tick

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Message-ID: <20240617141303.53857-1-frediano.ziglio@cloud.com>
Date: Mon, 17 Jun 2024 15:13:03 +0100
From: Frediano Ziglio <frediano.ziglio@...ud.com>
To: xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org
Cc: "H. Peter Anvin" <hpa@...or.com>,
	x86@...nel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Juergen Gross <jgross@...e.com>,
	Frediano Ziglio <frediano.ziglio@...ud.com>
Subject: [PATCH] x86/xen/time: Reduce Xen timer tick

Current timer tick is causing some deadline to fail.
The current high value constant was probably due to an old
bug in the Xen timer implementation causing errors if the
deadline was in the future.
This was fixed in Xen commit:
19c6cbd90965 xen/vcpu: ignore VCPU_SSHOTTMR_future

Signed-off-by: Frediano Ziglio <frediano.ziglio@...ud.com>
---
 arch/x86/xen/time.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 52fa5609b7f6..ce30b8d3efe7 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -30,7 +30,7 @@
 #include "xen-ops.h"
 
 /* Minimum amount of time until next clock event fires */
-#define TIMER_SLOP	100000
+#define TIMER_SLOP	1000
 
 static u64 xen_sched_clock_offset __read_mostly;
 
-- 
2.45.1