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Date: Tue, 05 Aug 2008 15:39:58 +0900
From: Yasunori Goto <y-goto@...fujitsu.com>
To: Christoph Lameter <cl@...ux-foundation.org>
Cc: Badari Pulavarty <pbadari@...ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>, linux-mm <linux-mm@...ck.org>,
Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing
> >> Duh. Then the use of RCU would also mean that all of reclaim must
> >> be in a rcu period. So reclaim cannot sleep anymore.
> >
> > I use srcu_read_lock() (sleepable rcu lock) if kernel must be sleep for
> > page reclaim. So, my patch basic idea is followings.
>
> But that introduces more overhead in __alloc_pages.
Hmmm. I think SRCU should be used when kernel has to sleep, and sleep time
will be bigger than SRCU's overhead.....
The followings are results of unixbench and lmbench.
I suppose my patch impacts lantency rather than throghput.
In these results, 100fd select and page fault latencies of lmbench became worse.
So I can't say there is no problem in my patches.
Anyway, I'll retry to find other less impact way if there is,
and compare benchmark results with this way.
Bye.
------------
Unixbench
-----
Normal 2.6.27-rc1-mm1
BYTE UNIX Benchmarks (Version 4.1.0)
System -- Linux localhost.localdomain 2.6.27-rc1-mm1 #1 SMP Mon Aug 4 16:08:48 JST 2008 ia64 ia64 ia64 GNU/Linux
Start Benchmark Run: 2008年 8月 5日 火曜日 10:24:35 JST
1 interactive users.
10:24:35 up 9 min, 1 user, load average: 0.16, 0.08, 0.03
lrwxrwxrwx 1 root root 4 2008-02-25 15:48 /bin/sh -> bash
/bin/sh: symbolic link to `bash'
/dev/sda5 33792348 18360424 13687672 58% /home
Execl Throughput 2954.0 lps (29.8 secs, 3 samples)
File Read 1024 bufsize 2000 maxblocks 1211570.0 KBps (30.0 secs, 3 samples)
File Write 1024 bufsize 2000 maxblocks 281599.0 KBps (30.0 secs, 3 samples)
File Copy 1024 bufsize 2000 maxblocks 218859.0 KBps (30.0 secs, 3 samples)
File Read 256 bufsize 500 maxblocks 328725.0 KBps (30.0 secs, 3 samples)
File Write 256 bufsize 500 maxblocks 72850.0 KBps (30.0 secs, 3 samples)
File Copy 256 bufsize 500 maxblocks 57095.0 KBps (30.0 secs, 3 samples)
File Read 4096 bufsize 8000 maxblocks 3883690.0 KBps (30.0 secs, 3 samples)
File Write 4096 bufsize 8000 maxblocks 1050752.0 KBps (30.0 secs, 3 samples)
File Copy 4096 bufsize 8000 maxblocks 564703.0 KBps (30.0 secs, 3 samples)
Pipe Throughput 462027.5 lps (10.0 secs, 10 samples)
Pipe-based Context Switching 105824.3 lps (10.0 secs, 10 samples)
Process Creation 2242.9 lps (30.0 secs, 3 samples)
System Call Overhead 1320907.8 lps (10.0 secs, 10 samples)
Shell Scripts (1 concurrent) 4442.1 lpm (60.0 secs, 3 samples)
Shell Scripts (8 concurrent) 1810.0 lpm (60.0 secs, 3 samples)
Shell Scripts (16 concurrent) 1042.7 lpm (60.0 secs, 3 samples)
INDEX VALUES
TEST BASELINE RESULT INDEX
Execl Throughput 43.0 2954.0 687.0
File Copy 1024 bufsize 2000 maxblocks 3960.0 218859.0 552.7
File Copy 256 bufsize 500 maxblocks 1655.0 57095.0 345.0
File Copy 4096 bufsize 8000 maxblocks 5800.0 564703.0 973.6
Pipe Throughput 12440.0 462027.5 371.4
Pipe-based Context Switching 4000.0 105824.3 264.6
Process Creation 126.0 2242.9 178.0
Shell Scripts (8 concurrent) 6.0 1810.0 3016.7
System Call Overhead 15000.0 1320907.8 880.6
=========
FINAL SCORE 565.6
2.6.27-rc1-mm1 with my patch
BYTE UNIX Benchmarks (Version 4.1.0)
System -- Linux localhost.localdomain 2.6.27-rc1-mm1-goto-test #2 SMP Mon Aug 4 18:50:56 JST 2008 ia64 ia64 ia64 GNU/Linux
Start Benchmark Run: 2008年 8月 4日 月曜日 20:35:11 JST
1 interactive users.
20:35:11 up 1:37, 1 user, load average: 0.00, 0.29, 0.71
lrwxrwxrwx 1 root root 4 2008-02-25 15:48 /bin/sh -> bash
/bin/sh: symbolic link to `bash'
/dev/sda5 33792348 18360420 13687676 58% /home
Execl Throughput 2949.0 lps (29.7 secs, 3 samples)
File Read 1024 bufsize 2000 maxblocks 1317211.0 KBps (30.0 secs, 3 samples)
File Write 1024 bufsize 2000 maxblocks 282643.0 KBps (30.0 secs, 3 samples)
File Copy 1024 bufsize 2000 maxblocks 220360.0 KBps (30.0 secs, 3 samples)
File Read 256 bufsize 500 maxblocks 361448.0 KBps (30.0 secs, 3 samples)
File Write 256 bufsize 500 maxblocks 73172.0 KBps (30.0 secs, 3 samples)
File Copy 256 bufsize 500 maxblocks 57489.0 KBps (30.0 secs, 3 samples)
File Read 4096 bufsize 8000 maxblocks 3819448.0 KBps (30.0 secs, 3 samples)
File Write 4096 bufsize 8000 maxblocks 1026563.0 KBps (30.0 secs, 3 samples)
File Copy 4096 bufsize 8000 maxblocks 585218.0 KBps (30.0 secs, 3 samples)
Pipe Throughput 482681.7 lps (10.0 secs, 10 samples)
Pipe-based Context Switching 101437.7 lps (10.0 secs, 10 samples)
Process Creation 2237.5 lps (30.0 secs, 3 samples)
System Call Overhead 1282198.4 lps (10.0 secs, 10 samples)
Shell Scripts (1 concurrent) 4447.7 lpm (60.0 secs, 3 samples)
Shell Scripts (8 concurrent) 1812.7 lpm (60.0 secs, 3 samples)
Shell Scripts (16 concurrent) 1041.7 lpm (60.0 secs, 3 samples)
INDEX VALUES
TEST BASELINE RESULT INDEX
Execl Throughput 43.0 2949.0 685.8
File Copy 1024 bufsize 2000 maxblocks 3960.0 220360.0 556.5
File Copy 256 bufsize 500 maxblocks 1655.0 57489.0 347.4
File Copy 4096 bufsize 8000 maxblocks 5800.0 585218.0 1009.0
Pipe Throughput 12440.0 482681.7 388.0
Pipe-based Context Switching 4000.0 101437.7 253.6
Process Creation 126.0 2237.5 177.6
Shell Scripts (8 concurrent) 6.0 1812.7 3021.2
System Call Overhead 15000.0 1282198.4 854.8
=========
FINAL SCORE 566.8
LMBENCH
The first lines are results of normal 2.6.27-rc1-mm1.
The second lines are results with my patch.
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
--------- ------------- ----------------------- ---- ----- ----- ------ ----
localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1
localhost Linux 2.6.27- ia64-linux-gnu 1600 128 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
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
localhost Linux 2.6.27- 1600 0.03 0.23 3.12 4.45 6.73 0.27 1.75 227. 463. 2219
localhost Linux 2.6.27- 1600 0.03 0.23 3.13 4.44 6.74 0.27 1.73 207. 448. 2230
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
--------- ------------- ------ ------ ------ ------ ------ ------- -------
localhost Linux 2.6.27- 11.3 11.4 11.5 11.5 12.7 11.8 14.6
localhost Linux 2.6.27- 11.5 11.4 11.5 11.6 12.8 11.9 14.7
*Local* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
localhost Linux 2.6.27- 11.3 8.464 28.3 13.4 28.7 46.
localhost Linux 2.6.27- 11.5 8.470 28.3 13.4 32.2 46.
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
--------- ------------- ------ ------ ------ ------ ------- ----- ------- -----
localhost Linux 2.6.27- 15.1 13.4 45.6 25.4 24.0K 0.384 0.23850 2.804
localhost Linux 2.6.27- 15.8 13.3 43.0 26.0 24.1K 0.401 0.25150 2.835
*Local* Communication bandwidths in MB/s - bigger is better
------------------------------------------------------------------------------
Host OS Description Mhz tlb cache mem scal
pages line par load
bytes
--------- ------------- ----------------------- ---- ----- ----- ------ ----
localhost Linux 2.6.27- ia64-linux-gnu 1600 128 1
localhost Linux 2.6.27- ia64-linux-gnu 1600 128 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
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
localhost Linux 2.6.27- 1600 0.03 0.23 3.12 4.45 6.73 0.27 1.75 227. 463. 2219
localhost Linux 2.6.27- 1600 0.03 0.23 3.13 4.44 6.74 0.27 1.73 207. 448. 2230
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
--------- ------------- ------ ------ ------ ------ ------ ------- -------
localhost Linux 2.6.27- 11.3 11.4 11.5 11.5 12.7 11.8 14.6
localhost Linux 2.6.27- 11.5 11.4 11.5 11.6 12.8 11.9 14.7
*Local* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP
ctxsw UNIX UDP TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
localhost Linux 2.6.27- 11.3 8.464 28.3 13.4 28.7 46.
localhost Linux 2.6.27- 11.5 8.470 28.3 13.4 32.2 46.
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
--------- ------------- ------ ------ ------ ------ ------- ----- ------- -----
localhost Linux 2.6.27- 15.1 13.4 45.6 25.4 24.0K 0.384 0.23850 2.804 <---!!!
localhost Linux 2.6.27- 15.8 13.3 43.0 26.0 24.1K 0.401 0.25150 2.835 <----!!!
*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
localhost Linux 2.6.27- 4814 4100 1188 2087.4 523.2 549.6 274.9 458. 523.5
localhost Linux 2.6.27- 4811 4111 1219 2090.8 523.1 549.4 276.1 458. 523.5
(END)
--
Yasunori Goto
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