Hello Joakim,
Joakim Tjernlund wrote:
>> Sent by: linuxppc-dev-bounces+joakim.tjernlund=transmode...@lists.ozlabs.org
>>
>> Rafael Beims <rbe...@gmail.com> wrote on 2011/01/10 17:35:38:
>>>> Once you have tested it and it works, please send a patch to remove the
>>>> 8xx workaround.
>>>> Make sure Scott is cc:ed
>>>>
>>>>
>>> I tested linux-2.6.33 on my ppc880 board today, and even without the
>>> slowdown.patch applied, the board runs processes with good
>>> performance.
>>> It really seems that the problem is solved from linux-2.6.33 on.
>>>
>>> I'm not sure what you mean by sending a patch to remove the
>>> workaround. The only thing that I did in the 2.6.32 version was to
>>> apply the slowdown.patch attached in the message from Michael.
>>>
>>> Could you clarify please?
>> Yes, this part in arch/powerpc/mm/pgtable.c:
>> #ifdef CONFIG_8xx
>> /* On 8xx, cache control instructions (particularly
>> * "dcbst" from flush_dcache_icache) fault as write
>> * operation if there is an unpopulated TLB entry
>> * for the address in question. To workaround that,
>> * we invalidate the TLB here, thus avoiding dcbst
>> * misbehaviour.
>> */
>> /* 8xx doesn't care about PID, size or ind args */
>> _tlbil_va(addr, 0, 0, 0);
>> #endif /* CONFIG_8xx */
>>
>> Should be removed in >= 2.6.33 kernels.
>> My 8xx TLB work fixes this problem more efficiently.
>
> Can you test these 2 patches on recent 2.6 linux:
>>From 9024200169bf86b4f34cb3b1ebf68e0056237bc0 Mon Sep 17 00:00:00 2001
> From: Joakim Tjernlund <joakim.tjernl...@transmode.se>
> Date: Tue, 11 Jan 2011 13:43:42 +0100
> Subject: [PATCH 1/2] powerpc: Move 8xx invalidation of non present TLBs
[...]
> and
>
>>From 0ef93601290a75b087495dddeee6062a870f1dc6 Mon Sep 17 00:00:00 2001
> From: Joakim Tjernlund <joakim.tjernl...@transmode.se>
> Date: Tue, 11 Jan 2011 13:55:22 +0100
> Subject: [PATCH 2/2] powerpc: Remove 8xx redundant dcbst workaround.
Tested this on a board similliar to the mainline tqm8xx board with
lmbench:
-bash-3.2# cat /proc/cpuinfo
processor : 0
cpu : 8xx
clock : 80.000000MHz
revision : 0.0 (pvr 0050 0000)
bogomips : 10.00
timebase : 5000000
platform : KUP4K
model : KUP4K
Memory : 96 MB
-bash-3.2#
-bash-3.2# cat /proc/version
Linux version 2.6.34-00064-g3e81b6b (h...@pollux.denx.de) (gcc version 4.2.2)
#89 Thu Jan 20 08:39:52 CET 2011
-bash-3.2#
(First run of lmbench without your 2 patches, the two other runs with it)
-bash-3.2# make see
cd results && make summary >summary.out 2>summary.errs
cd results && make percent >percent.out 2>percent.errs
-bash-3.2# cat results/summary.out
make[1]: Entering directory `/home/hs/lmbench-3.0-a9/results'
L M B E N C H 3 . 0 S U M M A R Y
------------------------------------
(Alpha software, do not distribute)
Basic system parameters
------------------------------------------------------------------------------
Host OS Description Mhz tlb cache mem scal
pages line par load
bytes
--------- ------------- ----------------------- ---- ----- ----- ------ ----
kup4k Linux 2.6.34- powerpc-linux-gnu 79 28 16 1.1400 1
kup4k Linux 2.6.34- powerpc-linux-gnu 79 28 16 1.0200 1
kup4k Linux 2.6.34- powerpc-linux-gnu 79 28 16 1.1000 1
Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host OS Mhz null null open slct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
kup4k Linux 2.6.34- 79 2.58 12.3 126. 1285 353. 22.8 149. 8418 34.K 101K
kup4k Linux 2.6.34- 79 2.59 13.1 127. 1273 320. 23.4 127. 8251 33.K 100K
kup4k Linux 2.6.34- 79 2.47 13.1 127. 1288 315. 23.6 128. 8413 34.K 101K
Basic integer operations - times in nanoseconds - smaller is better
-------------------------------------------------------------------
Host OS intgr intgr intgr intgr intgr
bit add mul div mod
--------- ------------- ------ ------ ------ ------ ------
kup4k Linux 2.6.34- 12.6 14.4 1.3500 103.9 170.6
kup4k Linux 2.6.34- 13.2 15.0 1.3100 100.0 170.5
kup4k Linux 2.6.34- 13.2 14.4 1.2900 104.1 162.1
Basic uint64 operations - times in nanoseconds - smaller is better
------------------------------------------------------------------
Host OS int64 int64 int64 int64 int64
bit add mul div mod
--------- ------------- ------ ------ ------ ------ ------
kup4k Linux 2.6.34- 12. 11.1 1637.9 1602.4
kup4k Linux 2.6.34- 13. 11.1 1643.6 1604.2
kup4k Linux 2.6.34- 13. 11.1 1639.7 1600.8
Basic float operations - times in nanoseconds - smaller is better
-----------------------------------------------------------------
Host OS float float float float
add mul div bogo
--------- ------------- ------ ------ ------ ------
kup4k Linux 2.6.34- 840.5 1304.3 4593.3 8703.0
kup4k Linux 2.6.34- 843.5 1366.6 4601.7 8814.0
kup4k Linux 2.6.34- 807.8 1377.5 4610.0 8710.0
Basic double operations - times in nanoseconds - smaller is better
------------------------------------------------------------------
Host OS double double double double
add mul div bogo
--------- ------------- ------ ------ ------ ------
kup4k Linux 2.6.34- 1309.2 2235.2 3132.2 13.9K
kup4k Linux 2.6.34- 1252.0 2339.0 2993.8 13.9K
kup4k Linux 2.6.34- 1311.2 2335.2 2997.2 13.9K
Context switching - times in microseconds - smaller is better
-------------------------------------------------------------------------
Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K
ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw
--------- ------------- ------ ------ ------ ------ ------ ------- -------
kup4k Linux 2.6.34- 131.8 144.7 130.8 168.4 207.8 190.7 248.1
kup4k Linux 2.6.34- 129.4 142.4 140.8 186.4 211.1 187.0 257.9
kup4k Linux 2.6.34- 121.3 155.6 131.0 196.8 201.5 198.5 240.7
*Local* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
kup4k Linux 2.6.34- 131.8 444.2 771. 1024. 1432. 3876
kup4k Linux 2.6.34- 129.4 455.2 722. 1021. 1434. 3831
kup4k Linux 2.6.34- 121.3 458.8 761. 1004. 1435. 3866
*Remote* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host OS UDP RPC/ TCP RPC/ TCP
UDP TCP conn
--------- ------------- ----- ----- ----- ----- ----
kup4k Linux 2.6.34-
kup4k Linux 2.6.34-
kup4k Linux 2.6.34-
File & VM system latencies in microseconds - smaller is better
-------------------------------------------------------------------------------
Host OS 0K File 10K File Mmap Prot Page 100fd
Create Delete Create Delete Latency Fault Fault selct
--------- ------------- ------ ------ ------ ------ ------- ----- ------- -----
kup4k Linux 2.6.34- 16.7K 10.3K 90.9K 13.7K 22.6K 27.1 43.4 117.9
kup4k Linux 2.6.34- 16.9K 15.6K 100.0K 16.1K 22.7K 9.590 39.8 119.2
kup4k Linux 2.6.34- 16.7K 13.5K 100.0K 15.9K 22.8K 9.306 39.8 119.6
*Local* Communication bandwidths in MB/s - bigger is better
-----------------------------------------------------------------------------
Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem
UNIX reread reread (libc) (hand) read write
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
kup4k Linux 2.6.34- 13.3 13.3 11.0 18.3 49.5 23.7 23.3 49.5 35.5
kup4k Linux 2.6.34- 13.2 13.4 10.8 18.4 49.5 23.4 23.2 49.5 35.4
kup4k Linux 2.6.34- 13.1 13.2 11.0 18.3 49.5 23.7 23.4 49.5 35.5
Memory latencies in nanoseconds - smaller is better
(WARNING - may not be correct, check graphs)
------------------------------------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem Rand mem Guesses
--------- ------------- --- ---- ---- -------- -------- -------
kup4k Linux 2.6.34- 79 26.4 278.6 277.0 1145.6 No L2
cache?
kup4k Linux 2.6.34- 79 26.4 278.7 277.1 1147.1 No L2
cache?
kup4k Linux 2.6.34- 79 26.4 278.8 276.6 1146.9 No L2
cache?
make[1]: Leaving directory `/home/hs/lmbench-3.0-a9/results'
-bash-3.2#
bye,
Heiko
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