Re: MSI interrupts

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Sujet : Re: MSI interrupts
De : mitchalsup (at) *nospam* aol.com (MitchAlsup1)
Groupes : comp.arch
Date : 25. Mar 2025, 17:40:17
Autres entêtes
Organisation : Rocksolid Light
Message-ID : <0343529d63f68c76b5e0d227ef6e39dd@www.novabbs.org>
References : 1 2 3 4 5
User-Agent : Rocksolid Light
On Tue, 25 Mar 2025 15:10:19 +0000, Dan Cross wrote:

In article <b201b9212700f9359a831e03b1d60cef@www.novabbs.org>,
MitchAlsup1 <mitchalsup@aol.com> wrote:
On Tue, 25 Mar 2025 13:45:39 +0000, Scott Lurndal wrote:
>
mitchalsup@aol.com (MitchAlsup1) writes:
>
Nothing gets lost.
>
This isn't a hardware transaction.   If the thread has updated data
and you take away the lock, the system is now inconsistent
and nasal daemons will ensue.
>
In HW there is a little thing known as branch misprediction repair,
where all the work done is made to appear as if those instructions
were never executed to begin with. The size of the branch mispredict
window is on the order of 300 instructions now.
>
With Spectré and Meltdown even cache updates must be delayed until
after the causing instruction retires.
>
But again, that's irrelevant.  The "critical sections" in
question here are software abstractions created by system
software.
Say you have a critical section (of your description) that was
preceded by an if-statement that was predicted to enter CS, but
1,000 cycles later the branch is resolved to not enter the CS.
{{Branch was dependent on an MMI/O location down the PCIe tree
which is why it took so long to resolve.}}
HW Backs the core up so that the RF and all memory locations
contain their original values at the point of the mispredicted
branch.
Can thread running on core even tell if you entered CS or not !
No, your thread cannot.

Date Sujet#  Auteur
13 Mar 25 * MSI interrupts162Robert Finch
13 Mar 25 `* Re: MSI interrupts161MitchAlsup1
13 Mar 25  +* Re: MSI interrupts5Robert Finch
13 Mar 25  i+- Re: MSI interrupts1MitchAlsup1
13 Mar 25  i`* Re: MSI interrupts3Robert Finch
13 Mar 25  i +- Re: MSI interrupts1MitchAlsup1
13 Mar 25  i `- Re: MSI interrupts1Stefan Monnier
13 Mar 25  `* Re: MSI interrupts155MitchAlsup1
13 Mar 25   `* Re: MSI interrupts154MitchAlsup1
14 Mar 25    `* Re: MSI interrupts153MitchAlsup1
14 Mar 25     `* Re: MSI interrupts152MitchAlsup1
14 Mar 25      `* Re: MSI interrupts151MitchAlsup1
15 Mar 25       `* Re: MSI interrupts150Robert Finch
15 Mar 25        `* Re: MSI interrupts149MitchAlsup1
15 Mar 25         `* Re: MSI interrupts148Robert Finch
16 Mar 25          `* Re: MSI interrupts147Robert Finch
16 Mar 25           +- Re: MSI interrupts1MitchAlsup1
17 Mar 25           +* Re: MSI interrupts142Michael S
17 Mar 25           i+- Re: MSI interrupts1Robert Finch
17 Mar 25           i+* Re: MSI interrupts133Robert Finch
18 Mar 25           ii+* Re: MSI interrupts127Robert Finch
19 Mar 25           iii+* Re: MSI interrupts124MitchAlsup1
19 Mar 25           iiii+* Re: MSI interrupts121Dan Cross
19 Mar 25           iiiii+* Re: MSI interrupts112MitchAlsup1
20 Mar 25           iiiiii`* Re: MSI interrupts111Dan Cross
20 Mar 25           iiiiii `* Re: MSI interrupts110MitchAlsup1
20 Mar 25           iiiiii  `* Re: MSI interrupts109Dan Cross
20 Mar 25           iiiiii   +* Re: MSI interrupts31MitchAlsup1
24 Mar 25           iiiiii   i`* Re: MSI interrupts30Dan Cross
24 Mar 25           iiiiii   i +* Re: MSI interrupts20MitchAlsup1
24 Mar 25           iiiiii   i i+* Re: MSI interrupts18Stefan Monnier
24 Mar 25           iiiiii   i ii`* Re: MSI interrupts17MitchAlsup1
24 Mar 25           iiiiii   i ii `* Re: MSI interrupts16Dan Cross
24 Mar 25           iiiiii   i ii  +* Re: MSI interrupts8MitchAlsup1
25 Mar 25           iiiiii   i ii  i`* Re: MSI interrupts7Dan Cross
25 Mar 25           iiiiii   i ii  i `* Re: MSI interrupts6Dan Cross
25 Mar 25           iiiiii   i ii  i  `* Re: MSI interrupts5Stefan Monnier
25 Mar 25           iiiiii   i ii  i   +- Re: MSI interrupts1Stefan Monnier
25 Mar 25           iiiiii   i ii  i   +- Re: MSI interrupts1Dan Cross
27 Mar 25           iiiiii   i ii  i   `* Re: MSI interrupts2Terje Mathisen
27 Mar 25           iiiiii   i ii  i    `- Re: MSI interrupts1MitchAlsup1
25 Mar 25           iiiiii   i ii  `* Re: MSI interrupts7Chris M. Thomasson
25 Mar 25           iiiiii   i ii   `* Re: MSI interrupts6Dan Cross
25 Mar 25           iiiiii   i ii    `* Re: MSI interrupts5Chris M. Thomasson
25 Mar 25           iiiiii   i ii     `* Re: MSI interrupts4Dan Cross
26 Mar 25           iiiiii   i ii      `* Re: MSI interrupts3Chris M. Thomasson
26 Mar 25           iiiiii   i ii       `* Re: MSI interrupts2Dan Cross
26 Mar 25           iiiiii   i ii        `- Re: MSI interrupts1Chris M. Thomasson
24 Mar 25           iiiiii   i i`- Re: MSI interrupts1Dan Cross
24 Mar 25           iiiiii   i +- Re: MSI interrupts1MitchAlsup1
24 Mar 25           iiiiii   i `* Re: MSI interrupts8Dan Cross
24 Mar 25           iiiiii   i  `* Re: MSI interrupts7Chris M. Thomasson
24 Mar 25           iiiiii   i   `* Re: MSI interrupts6Dan Cross
25 Mar 25           iiiiii   i    `* Re: MSI interrupts5Chris M. Thomasson
25 Mar 25           iiiiii   i     +* Re: MSI interrupts2Chris M. Thomasson
25 Mar 25           iiiiii   i     i`- Re: MSI interrupts1Dan Cross
25 Mar 25           iiiiii   i     `* Re: MSI interrupts2Dan Cross
25 Mar 25           iiiiii   i      `- Re: MSI interrupts1Chris M. Thomasson
24 Mar 25           iiiiii   +- Re: MSI interrupts1Chris M. Thomasson
24 Mar 25           iiiiii   `* Re: MSI interrupts76Dan Cross
24 Mar 25           iiiiii    +* Re: MSI interrupts57MitchAlsup1
25 Mar 25           iiiiii    i`* Re: MSI interrupts56Dan Cross
25 Mar 25           iiiiii    i `* Re: MSI interrupts55MitchAlsup1
25 Mar 25           iiiiii    i  +* Re: MSI interrupts2Stefan Monnier
25 Mar 25           iiiiii    i  i`- Re: MSI interrupts1Chris M. Thomasson
25 Mar 25           iiiiii    i  +- Re: MSI interrupts1Dan Cross
25 Mar 25           iiiiii    i  `* Re: MSI interrupts51MitchAlsup1
25 Mar 25           iiiiii    i   `* Re: MSI interrupts50Dan Cross
25 Mar 25           iiiiii    i    `* Re: MSI interrupts49MitchAlsup1
25 Mar 25           iiiiii    i     `* Re: MSI interrupts48Dan Cross
25 Mar 25           iiiiii    i      `* Re: MSI interrupts47MitchAlsup1
25 Mar 25           iiiiii    i       `* Re: MSI interrupts46Dan Cross
25 Mar 25           iiiiii    i        +* Re: MSI interrupts8Stefan Monnier
26 Mar 25           iiiiii    i        i+* Re: MSI interrupts5Dan Cross
26 Mar 25           iiiiii    i        ii`* Re: MSI interrupts4Stefan Monnier
26 Mar 25           iiiiii    i        ii +- Re: MSI interrupts1Dan Cross
26 Mar 25           iiiiii    i        ii `* Re: MSI interrupts2MitchAlsup1
27 Mar 25           iiiiii    i        ii  `- Re: MSI interrupts1Stefan Monnier
26 Mar 25           iiiiii    i        i+- Re: MSI interrupts1Chris M. Thomasson
26 Mar 25           iiiiii    i        i`- Re: MSI interrupts1MitchAlsup1
26 Mar 25           iiiiii    i        `* Re: MSI interrupts37MitchAlsup1
26 Mar 25           iiiiii    i         `* Re: MSI interrupts36Dan Cross
26 Mar 25           iiiiii    i          +* Re: MSI interrupts4Stefan Monnier
26 Mar 25           iiiiii    i          i`* Re: MSI interrupts3Dan Cross
26 Mar 25           iiiiii    i          i `* Re: MSI interrupts2Chris M. Thomasson
4 Apr 25           iiiiii    i          i  `- Re: MSI interrupts1Chris M. Thomasson
26 Mar 25           iiiiii    i          `* Re: MSI interrupts31MitchAlsup1
26 Mar 25           iiiiii    i           +- Re: MSI interrupts1Stefan Monnier
26 Mar 25           iiiiii    i           +* Re: MSI interrupts2Stefan Monnier
27 Mar 25           iiiiii    i           i`- Re: MSI interrupts1MitchAlsup1
27 Mar 25           iiiiii    i           +* Re: MSI interrupts3MitchAlsup1
27 Mar 25           iiiiii    i           i`* Re: MSI interrupts2MitchAlsup1
27 Mar 25           iiiiii    i           i `- Re: MSI interrupts1Dan Cross
27 Mar 25           iiiiii    i           `* Re: MSI interrupts24Dan Cross
27 Mar 25           iiiiii    i            +* Re: MSI interrupts2Stefan Monnier
27 Mar 25           iiiiii    i            i`- Re: MSI interrupts1Dan Cross
27 Mar 25           iiiiii    i            +* Re: MSI interrupts12MitchAlsup1
28 Mar 25           iiiiii    i            i`* Re: MSI interrupts11Dan Cross
28 Mar 25           iiiiii    i            i +- Re: MSI interrupts1MitchAlsup1
28 Mar 25           iiiiii    i            i +* Re: MSI interrupts5MitchAlsup1
28 Mar 25           iiiiii    i            i i+* Re: MSI interrupts3Stefan Monnier
28 Mar 25           iiiiii    i            i i`- Re: MSI interrupts1Dan Cross
28 Mar 25           iiiiii    i            i +* Re: MSI interrupts2Stefan Monnier
28 Mar 25           iiiiii    i            i `* Re: MSI interrupts2Chris M. Thomasson
27 Mar 25           iiiiii    i            `* Re: MSI interrupts9MitchAlsup1
25 Mar 25           iiiiii    `* Re: MSI interrupts18Dan Cross
20 Mar 25           iiiii`* Re: MSI interrupts8MitchAlsup1
19 Mar 25           iiii`* Re: MSI interrupts2MitchAlsup1
19 Mar 25           iii`* Re: MSI interrupts2Robert Finch
18 Mar 25           ii`* Re: MSI interrupts5MitchAlsup1
17 Mar 25           i`* Re: MSI interrupts7MitchAlsup1
17 Mar 25           `* Re: MSI interrupts3Robert Finch

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