Date: Wed, 4 Oct 1995 06:57:52 +1000 From: Bruce Evans <bde@zeta.org.au> To: current@freebsd.org Subject: lmbench 1.1.5 vs 2.2-current Message-ID: <199510032057.GAA30471@godzilla.zeta.org.au>
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2.2-current seems to be significantly slower than 1.1.5 in many areas.
These benchmarks were run on the same machine except for a faster disk
and a possibly different L2 cache setting for 2.2-current.
The faster disk and clustering speed up the file reread benchmark by a
factor of 8. The local tcp bandwidth is anomalously slow in
2.2-current. mmap has been tuned for faster access at a cost of
increased setup overhead in 2.2-current. Otherwise, these benchmarks
show unexplained lossages (probably mostly due to vfs bloat) of 10-40%
for 2.2-current.
lmbench only runs properly on systems with significantly more than
16MB of memory because it does one test that wants 2 8MB arrays in
memory at the same time. I usually delete one 8192 to eliminate the
bogus test. More things break on 8MB machines. Has anyone fixed
this properly? (the current port doesn't).
Bruce
L M B E N C H 1 . 0 S U M M A R Y
------------------------------------
Processor, Processes - times in microseconds
--------------------------------------------
Host OS Mhz Null Null Simple /bin/sh Mmap 2-proc 8-proc
Syscall Process Process Process lat ctxsw ctxsw
--------- ------------- ---- ------- ------- ------- ------- ---- ------ ------
Alphplex. FreeBSD 1.1.5 66 19 8.2K 35.4K 88K 2299 33 40
alphplex FreeBSD 2.2-C 66 30 6.8K 32.5K 91K 313 56 59
*Local* Communication latencies in microseconds
-----------------------------------------------
Host OS Pipe UDP RPC/ TCP RPC/
UDP TCP
--------- ------------- ------- ------- ------- ------- -------
Alphplex. FreeBSD 1.1.5 210 505 953 731 1320
alphplex FreeBSD 2.2-C 285 626 1249 743 1452
*Local* Communication bandwidths in megabytes/second
----------------------------------------------------
Host OS Pipe TCP File Mmap Bcopy Bcopy Mem Mem
reread reread (libc) (hand) read write
--------- ------------- ---- ---- ------ ------ ------ ------ ---- -----
Alphplex. FreeBSD 1.1.5 8 4.3 1.1 5.3 17 0 0 30
alphplex FreeBSD 2.2-C 8 0.2 8.6 12.4 17 0 0 30
Memory latencies in nanoseconds
(WARNING - may not be correct, check graphs)
--------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem TLB Guesses
--------- ------------- --- ---- ---- -------- --- -------
Alphplex. FreeBSD 1.1.5 66 18 295 731 971
alphplex FreeBSD 2.2-C 66 18 379 733 909
L M B E N C H 1 . 0 S U M M A R Y
------------------------------------
Comparison to best of the breed
-------------------------------
(Best numbers are starred, i.e., *123)
Processor, Processes - factor slower than the best
--------------------------------------------------
Host OS Mhz Null Null Simple /bin/sh Mmap 2-proc 8-proc
Syscall Process Process Process lat ctxsw ctxsw
--------- ------------- ---- ------- ------- ------- ------- ---- ------ ------
Alphplex. FreeBSD 1.1.5 66 *19 1.2 1.1 *85.6K 7.3 *33 *40
alphplex FreeBSD 2.2-C 66 1.6 *6.7K *31.7K 1.0 *313 1.7 1.5
*Local* Communication latencies - factor slower than the best
-------------------------------------------------------------
Host OS Pipe UDP RPC/ TCP RPC/
UDP TCP
--------- ------------- ------- ------- ------- ------- -------
Alphplex. FreeBSD 1.1.5 *210 *505 *953 *731 *1320
alphplex FreeBSD 2.2-C 1.4 1.2 1.3 1.0 1.1
*Local* Communication bandwidths - percentage of the best
---------------------------------------------------------
Host OS Pipe TCP File Mmap Bcopy Bcopy Mem Mem
reread reread (libc) (hand) read write
--------- ------------- ---- ---- ------ ------ ------ ------ ---- -----
Alphplex. FreeBSD 1.1.5 *8 *4 13% 42% 99% *0 *0 99%
alphplex FreeBSD 2.2-C *8 4% *8 *12 *16 *0 *0 *30
Memory latencies in nanoseconds - factor slower than the best
(WARNING - may not be correct, check graphs)
-------------------------------------------------------------
Host OS Mhz L1 $ L2 $ Main mem TLB Guesses
--------- ------------- --- ---- ---- -------- --- -------
Alphplex. FreeBSD 1.1.5 66 *18 *295 *731 1.1
alphplex FreeBSD 2.2-C 66 *18 1.3 1.0 *909
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