[Qemu-devel] [PATCH 0/6] A cumulative MIPS patchset

[Thiemo Seufer]

Hello All,

The following patchset collects the most important improvements of
MIPS system emulation mode:

qemu.drow-performance   # TLB performance improvements
qemu.drow-halt-reboot   # support for halt and reboot
moredevices             # A few more devices, most importantly RTC
mfc0-inline             # inline MFC0 instructions
mtc0-inline             # inline MTC0 instructions
opcode-handling         # MIPS32R2 support and retionalised instruction
                        # decoding

Daniel's improvements of the TLB emulation allow finally some useful
performance measurements for inlining of CP0 accesses. The appended
lmbench result shows general improvements. The first line is qemu
patched with the whole patchset, the second is qemu patched up to
moredevices. Both runs usd the same binaries, without using the
MIPS32R2 improvements.


Thiemo



                 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  
--------- ------------- ----------------------- ---- ----- ----- ------ ----
lagash-qe Linux 2.6.18-          mips-linux-gnu  185                       1
lagash-qe Linux 2.6.18-          mips-linux-gnu  185                       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
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
lagash-qe Linux 2.6.18-  185 1.48 4.52 53.0 85.0 126. 12.1 71.6 7104 33.K 142K
lagash-qe Linux 2.6.18-  185 2.05 5.71 55.0 91.6 135. 13.0 74.0 7221 33.K 142K

Basic integer operations - times in nanoseconds - smaller is better
-------------------------------------------------------------------
Host                 OS  intgr intgr  intgr  intgr  intgr  
                          bit   add    mul    div    mod   
--------- ------------- ------ ------ ------ ------ ------ 
lagash-qe Linux 2.6.18- 5.9500 0.0900   20.7   32.6   37.9
lagash-qe Linux 2.6.18- 6.0300 0.0900   20.9   33.4   38.5

Basic uint64 operations - times in nanoseconds - smaller is better
------------------------------------------------------------------
Host                 OS int64  int64  int64  int64  int64  
                         bit    add    mul    div    mod   
--------- ------------- ------ ------ ------ ------ ------ 
lagash-qe Linux 2.6.18-                                   
lagash-qe Linux 2.6.18-                                   

Basic float operations - times in nanoseconds - smaller is better
-----------------------------------------------------------------
Host                 OS  float  float  float  float
                         add    mul    div    bogo
--------- ------------- ------ ------ ------ ------ 
lagash-qe Linux 2.6.18-   77.7  114.3  153.9  536.6
lagash-qe Linux 2.6.18-   78.6  113.9  155.7  543.0

Basic double operations - times in nanoseconds - smaller is better
------------------------------------------------------------------
Host                 OS  double double double double
                         add    mul    div    bogo
--------- ------------- ------  ------ ------ ------ 
lagash-qe Linux 2.6.18-  154.4  178.4  362.2 1071.8
lagash-qe Linux 2.6.18-  156.2  188.0  366.4 1078.5

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
--------- ------------- ------ ------ ------ ------ ------ ------- -------
lagash-qe Linux 2.6.18-   49.1  127.1  380.8  291.7  692.9   343.4   796.5
lagash-qe Linux 2.6.18-   49.0  116.3  350.2  291.1  668.7   342.9   784.2

*Local* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host                 OS 2p/0K  Pipe AF     UDP  RPC/   TCP  RPC/ TCP
                        ctxsw       UNIX         UDP         TCP conn
--------- ------------- ----- ----- ---- ----- ----- ----- ----- ----
lagash-qe Linux 2.6.18-  49.1 199.6 409. 782.2       1940.       7957
lagash-qe Linux 2.6.18-  49.0 193.2 433. 851.3       1888.       7827

*Remote* Communication latencies in microseconds - smaller is better
---------------------------------------------------------------------
Host                 OS   UDP  RPC/  TCP   RPC/ TCP
                               UDP         TCP  conn
--------- ------------- ----- ----- ----- ----- ----
lagash-qe Linux 2.6.18-                             
lagash-qe Linux 2.6.18-                             

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
--------- ------------- ------ ------ ------ ------ ------- ----- ------- -----
lagash-qe Linux 2.6.18-                              9447.0  11.8    41.2  80.8
lagash-qe Linux 2.6.18-                               10.3K  13.7    46.4 123.1

*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
--------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- -----
lagash-qe Linux 2.6.18- 28.7 26.7 14.2   49.1   85.3   66.7   44.0 87.5 110.6
lagash-qe Linux 2.6.18- 28.6 27.1 14.6   47.8   83.7   63.9   43.1 84.1 109.5

Memory latencies in nanoseconds - smaller is better
    (WARNING - may not be correct, check graphs)
------------------------------------------------------------------------------
Host                 OS   Mhz   L1 $   L2 $    Main mem    Rand mem    Guesses
--------- -------------   ---   ----   ----    --------    --------    -------
lagash-qe Linux 2.6.18-   185   16.9   21.0  574.1       13.5K    No L1 cache?
lagash-qe Linux 2.6.18-   185   17.8   22.0  563.5       13.8K    No L1 cache?