[FUG-BR] Fwd: Tunning no Squid
William Armstrong
biosystems em gmail.com
Sex Nov 11 11:08:49 BRST 2005
só completando
desculpem o anexo mas é bem interessante para o assunto abordado
D.4 FreeBSD
FreeBSD is another popular Squid platform, and my personal favorite.
Table D-2 and Figure D-2
summarize the results for FreeBSD. Again, coss exhibits the highest
throughput, followed by
diskd. The aufs storage scheme doesn't currently run on FreeBSD. These
results come from
FreeBSD Version 4.8-STABLE (released April 3, 2003). I built a kernel
with the following
noteworthy options:
options MSGMNB=16384
options MSGMNI=41
options MSGSEG=2049
options MSGSSZ=64
options MSGTQL=512
options SHMSEG=16
options SHMMNI=32
options SHMMAX=2097152
options SHMALL=4096
options MAXFILES=8192
options NMBCLUSTERS=32768
options VFS_AIO
Table D-2. FreeBSD benchmarking results
Storage
scheme Filesystem Mount options Throughput Response time Hit ratio
coss 330.7 1.58 54.5
diskd(1) UFS async, noatime, softupdate 129.0 1.58 54.1
diskd(2) UFS 77.4 1.47 56.2
ufs(1) UFS async, noatime, softupdate 38.0 1.49 56.8
ufs(2) UFS noatime 31.1 1.54 55.0
ufs(3) UFS async 30.2 1.51 55.9
ufs(4) UFS softupdate 29.9 1.51 55.7
ufs(5) UFS 24.4 1.50 56.4
Figure D-2. FreeBSD filesystem benchmarking traces
Enabling the async, noatime , and softupdate[3] options boosts the
standard ufs performance
from 24 to 38 transactions per second. However, using one of the other
storage schemes
increases the sustainable throughput even more.
[3] On FreeBSD, softupdates aren't a mount option, but must be set with the
tunefs command.
FreeBSD's diskd performance (129/sec) isn't quite as good as on Linux
(169/sec), perhaps
because the underlying filesystem (ext2fs) is better.
Note that the trace for coss is relatively flat. Its performance
doesn't change much over time.
Furthermore, both FreeBSD and Linux report similar throughput numbers:
326/sec and 331/
sec. This leads me to believe that the disk system isn't a bottleneck
in these tests. In fact, the
test with no disk cache (see Section D.8) achieves essentially the
same throughput (332/sec).
--
-=-=-=-=-=-=-=-=-=-
William David Armstrong
Bio Systems Security.
ICQ 10253747 MSN bio__wolf em hotmail.com
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