search for: 0ns

Hello I have few questions regarding tc functionality (qdiscs, classes, etc.) when vlans are in use. For example, consider interface eth0, for which I create and extra vlan with vconfig, let''s say eth0.11. Then using tc I can add usual things - qdiscs, filters, ... - to both eth0 and eth0.11. The questions are: - on which interface - virtual or real, should I actually use tc ? Or

...r) { b.iter(|| { (0..1000).fold(0, |old, new| old ^ new); }); } ``` is completely optimized away. Granted, IRL production (ignoring the question of why this code was ever used in production in the first place) this optimization is desired, but here it leads to bogus measurements (ie 0ns per iteration). By using `test::black_box`, one would have ```rust #[bench] fn bench_xor_1000_ints(b: &mut Bencher) { b.iter(|| { let n = test::black_box(1000); // optional test::black_box((0..n).fold(0, |old, new| old ^ new)); }); } ``` and the microbenchmark wouldn...

...be preempted at any time, which means the determination of "now" can be arbitrarily deferred. However, an absolute time is only meaningful if the kernel and hypervisor are operating off the same timebase (ie, no drift). In general, the kernel's monotonic timer is going to start from 0ns when the virtual machine is booted, and the hypervisor's is going to start at 0ns when the hypervisor is booted. If they're operating off the same timebase, then in principle you can work out a constant offset between the two, and use that for converting a kernel absolute time into a hyper...

...be preempted at any time, which means the determination of "now" can be arbitrarily deferred. However, an absolute time is only meaningful if the kernel and hypervisor are operating off the same timebase (ie, no drift). In general, the kernel's monotonic timer is going to start from 0ns when the virtual machine is booted, and the hypervisor's is going to start at 0ns when the hypervisor is booted. If they're operating off the same timebase, then in principle you can work out a constant offset between the two, and use that for converting a kernel absolute time into a hyper...

On Mon, Nov 2, 2015 at 9:16 PM, Daniel Berlin <dberlin at dberlin.org> wrote: > I'm very unclear and why you think a generic black box intrinsic will have > any different performance impact ;-) > > > I'm also unclear on what the goal with this intrinsic is. > I understand the symptoms you are trying to solve - what exactly is the > disease. > > IE you say

...ge, EnterModifiedCompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+, EqualizationPhase1+ EqualizationPhase2+, EqualizationPhase3-, LinkEqualizationRequest- Capabilities: [100 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256- Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff Status: NegoPending- InProgress- Capabili...

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...De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+, EqualizationPhase1+ EqualizationPhase2+, EqualizationPhase3+, LinkEqualizationRequest- Capabilities: [100 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-...

...ge, EnterModifiedCompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- Capabilities: [100 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256- Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff Status: NegoPending- InProgress- Capabili...

Greetings, I am resending this as it doesn't appear in the archives and no one responded...maybe it got routed to /dev/null or something :-) I have asked this question the Scientific Linux mailing list (a few months ago) and got the suggestion I talk to the kernel guys. I pinged a kernel guy I know, and his suggestion was to ask the Nouveau list. So here I am. :-) I have had my work laptop

*RESEND* due to exceeding the mailinglists limit for attachment size. Hi, I''m trying to get secondary vga-passthrough on a HVM guest to work with a AMD HD6570 and the native kernel radeon driver and kernel modesetting. So the guest still gets the emulated stdvga or cirrus device(used in my case here) as primary/boot vga adapter. - When i don''t passthrough the radeon card, the