Date: Wed, 22 Mar 2017 11:28:15 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-virtualization@FreeBSD.org Subject: [Bug 216759] [kern] Memory speed with small blocks (1K) up to 35 times slower than host system (under QEMU emulation, but not only) Message-ID: <bug-216759-27103-EjdN0reBql@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-216759-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-216759-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216759 andrew@azar-a.net changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #181048| |maintainer-approval+ Flags| | --- Comment #18 from andrew@azar-a.net --- Created attachment 181048 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181048&action=edit tsc.c patch to allow KVM hypervisor with host cpu to pass through the good TSC This patch is not "correct" because it just whitelists Generic virtualization (VM_GUEST_VM), however I don't see how it can be done correctly at this point of overall coding quality in tsc.c regarding virtualization. I guess a CPU_VENDOR_VIRTUAL should be considered as an option, so we can leave host pass-through CPU as a real host CPU and allow virtual CPUs like QEMU_X86_64 or whatever to be treated separately where all ifs and switches are tested for stability of CPU TSC (that seems to be the Linux approach). -- You are receiving this mail because: You are the assignee for the bug.
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