Date: Thu, 21 Nov 2024 21:36:15 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 254040] AMD 5950X hyperthreading strange performance swings Message-ID: <bug-254040-227-AIMcwjymD4@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-254040-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254040 Mark Johnston <markj@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Open CC| |markj@FreeBSD.org --- Comment #6 from Mark Johnston <markj@FreeBSD.org> --- Is this still a problem on supported releases? A few years ago I fixed a few scheduler race conditions, mostly in ULE, that caused cores to go idle even with pending work. I tried running this on a 16-core AMD 7950X3D with hyperthreading enabled, and don't see much variance: git (main) markj@xinde> for i in $(seq 1 10); do t; done 1048576000 bytes transferred in 4.312122 secs (243169371 bytes/sec) 1048576000 bytes transferred in 4.062625 secs (258103089 bytes/sec) 1048576000 bytes transferred in 4.081073 secs (256936378 bytes/sec) 1048576000 bytes transferred in 4.017203 secs (261021443 bytes/sec) 1048576000 bytes transferred in 4.118516 secs (254600457 bytes/sec) 1048576000 bytes transferred in 4.063185 secs (258067483 bytes/sec) 1048576000 bytes transferred in 4.067748 secs (257778022 bytes/sec) 1048576000 bytes transferred in 4.484794 secs (233806939 bytes/sec) 1048576000 bytes transferred in 4.207453 secs (249218714 bytes/sec) 1048576000 bytes transferred in 3.954746 secs (265143670 bytes/sec) -- You are receiving this mail because: You are the assignee for the bug.home | help
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