Re: spin lock panic in 5.2-REL

On Wed, 28 Jan 2004 12:50:43 -0600, Jeremy Messenger <mezz7_at_cox.net> wrote:

> On Wed, 28 Jan 2004 12:43:10 -0500, John Baldwin <jhb_at_FreeBSD.org> wrote:
>
>> On Tuesday 27 January 2004 05:19 pm, Peter Losher wrote:
>>> On Tuesday 27 January 2004 10:34 am, John Baldwin wrote:
>>> > This is a very hard to debug problem.  If WITNESS is on it provides 
>>> more
>>> > useful information that can help track that down, but I wouldn't 
>>> expect a
>>> > production machine to be using WITNESS.
>>>
>>> Yes, I was running a kernel for a short while w/ INVARIANTS and 
>>> WITNESS,
>>> but it was basically useless after a couple of hours under load under 
>>> the
>>> giant lock.  How much of a performance hit is just WITNESS?
>>
>> A lot.  I think Robert Watson has seen as high a performance impact as 
>> 40%.
>
> I have played with the bytebench few days ago, just for fun... This 
> machine that I played is 464Mhz and 386mb ram; it uses libkse and ULE
I mean, 384---------------------------^^^

> (four days ago -CURRENT).
>
> W/OUT-DEBUG = Remove all debug options from kernel and set 
> /etc/malloc.conf->aj..
>
> =================================
>                                          --W/-DEBUG--    -W/OUT-DEBUG-
> Dhrystone 2 without register variables  1105081.4 lps   1097325.0 lps
> Dhrystone 2 using register variables    1100857.8 lps   1109398.3 lps
> Arithmetic Test (type = arithoh)        2076290.3 lps   2086816.9 lps
> Arithmetic Test (type = register)       125288.4 lps    126051.2 lps
> Arithmetic Test (type = short)          125818.8 lps    126406.5 lps
> Arithmetic Test (type = int)            125481.3 lps    126101.5 lps
> Arithmetic Test (type = long)           125293.6 lps    126067.5 lps
> Arithmetic Test (type = float)          145203.2 lps    146956.6 lps
> Arithmetic Test (type = double)         145017.1 lps    145718.5 lps
> System Call Overhead Test               11830.6 lps     109590.1 lps
> Pipe Throughput Test                    20572.7 lps     96916.4 lps
> Pipe-based Context Switching Test       6856.2 lps      25128.9 lps
> Process Creation Test                   155.1 lps       865.2 lps
> Execl Throughput Test                   62.7 lps        261.0 lps
> File Read  (10 seconds)                 40538.0 KBps    246172.0 KBps
> File Write (10 seconds)                 7033.0 KBps     11565.0 KBps
> File Copy  (10 seconds)                 4907.0 KBps     12555.0 KBps
> File Read  (30 seconds)                 40688.0 KBps    246785.0 KBps
> File Write (30 seconds)                 7022.0 KBps     11343.0 KBps
> File Copy  (30 seconds)                 4763.0 KBps     12400.0 KBps
> C Compiler Test                         187.1 lpm       327.1 lpm
> Shell scripts (1 concurrent)            98.0 lpm        623.6 lpm
> Shell scripts (2 concurrent)            50.6 lpm        326.3 lpm
> Shell scripts (4 concurrent)            26.0 lpm        168.0 lpm
> Shell scripts (8 concurrent)            13.0 lpm        82.0 lpm
> Dc: sqrt(2) to 99 decimal places        5299.0 lpm      31721.7 lpm
> Recursion Test--Tower of Hanoi          11543.3 lps     11618.8 lps
>
>
>                       INDEX VALUES       ---------W/-DEBUG---------   
> --------W/OUT-DEBUG-------
> TEST                                    BASELINE  RESULT     INDEX   
> BASELINE  RESULT     INDEX
>
> Arithmetic Test (type = double)         2541.7    145017.1   57.1    
> 2541.7    145718.5   57.3
> Dhrystone 2 without register variables  22366.3   1105081.4  49.4    
> 22366.3   1097325.0  49.1
> Execl Throughput Test                   16.5      62.7       3.8     
> 16.5      261.0      15.8
> File Copy  (30 seconds)                 179.0     4763.0     26.6    
> 179.0     12400.0    69.3
> Pipe-based Context Switching Test       1318.5    6856.2     5.2     
> 1318.5    25128.9    19.1
> Shell scripts (8 concurrent)            4.0       13.0       3.2     
> 4.0       82.0       20.5
>                                                           =========                    
> =========
>       SUM of  6 items                                         
> 145.3                        231.0
>       AVERAGE                                                  
> 24.2                         38.5
> =================================
>
> Cheers,
> Mezz
>
>



-- 
bsdforums.org 's moderator, mezz.