Re: [squid-users] Squid limits and hardware spec

Hi all,

Also concerned about my performance I think you could
consider bandwidth limits, I found a good bandwidth
monitorin utility for linux I use on Fedora Club 3.

bwm-ng

cheers, Daniel Navarro
        Maracay, Venezuela
        www.csaragua.com/ecodiver

 --- Martin Marji Cermak <mc1@trimedia.cz> escribió:
> Hello Ow at Neuromancer :-) and all Squid guys,
> I promised to post here my Squid results.
>
> I am trying to find out what a single Squid box can
> do - I have 3200
> unique IPs and 240 HTTP requests per second during
> peek time.
> I hande this load with one box, using WCCP to get
> the traffic to Squid
> (so it is a transparet proxy - the evil thing :-).
>
> My goal is to achive maximum BYTE hit ratio.
>
> USED HARDWARE:
> server: IBM x305
> Processor: P4 2.8GHz
> Memory: 4 GB (you can switch the swap off)
> Hardisk: 2 x 36GB 10 RPM, 2 x 73 15 RPM scsi
> disks
> Controler: IBM 71P8594 Kendall Card Option
> <Adaptec 29320LP Ultra320 SCSI
> adapter>
> Hardisk for logs: IDE 7200, DMA
> Ethernet card: Broadcom TG3
>
> OS: Linux Debian/woody, kernel 2.4.25, tproxy, wccp
>
> Unfortunately, I do not have enough clients to reach
> the box limits.
> But I can see that my median HIT time triples during
> peak time, which
> probably means a disk bottleneck. But it will be the
> log disk, because I
> use an IDE disk for log (with log_mime_header on, so
> I get an 500 MB
> acccess.log per hour). And also the DNS server (see
> below) - DNS
> responses are longer during peak time.
>
> I know it is not good to combine different disk (15
> rpm and 10 rpm), but
> I had no choice.
>
> Maximum performance I have achived (MRTG stats gaind
> by SNMP from squid):
>
> Client HTTP Requests per second: 220
> Server Requests per second: 210
> Server In 1600 kBytes/s
> (amount of traffic read from origin WWW servers)
> System load: 3, occasionally rises to 10 and I don't
> know why
> HTTP Out: 2000 kBytes/s
> (amount of traffic written to clients)
> HTTP Hits per second: 110
> Squid generated Error Pages: 2 errors per second
> Total accounted memory in GRI: 830 MB
> Storage disk size: 164 GB
> Storage Mem Size: 200 MB
> HTTP I/O Number of Reads: 300 reads/sec
> Number of Clients Accessing Cache: 3200
> (unique IPs since Squid started)
> HTTP all service time: 150 ms
> HTTP miss service time: 490 ms
> HTTP Near Miss Service Time: 8 ms
> HTTP hit service time: 30 ms (average is 10 ms)
> Byte Hit Ratio: 20% (heap LFUDA)
> Request Hit Ratio: 64% (49% average)
> Disks: 800 writes per second
> Log disk (IDE - the bottleneck): 500 writes per sec
> DNS service time: 70 ms (bottleneck)
>
> Configuration (squid.conf)
> maximum_object_size 200 MB
> cache_mem 200 MB
> cache_replacement_policy heap LFUDA
> log_mime_hdrs on
> store_avg_object_size 22 KB
> store_dir_select_algorithm round-robin
> (if least-load, it does not distribute the load
> properly)
> cache_dir aufs /squidcache/cache1 28000 60 256
> cache_dir aufs /squidcache/cache2 56000 60 256
> cache_dir aufs /squidcache/cache3 28000 60 256
> cache_dir aufs /squidcache/cache4 56000 60 256
>
>
> Please notice that I encoutered a DNS issue.
> Squid generated more requests per second (500?) than
> the DNS server was
> able to accept (200?). My coleague administrator had
> to recompile it and
> icrease the number. From this point, the squid
> performance has been
> better in peak time. The HIT service time does not
> tripple, but double
> only during peak time.
>
>
> Another important think:
> I had to renice all standard linux maintenance
> programs, e.g. in
> /etc/crontab:
> /usr/bin/nice -n 19 run-parts --report
> /etc/cron.daily
>
> these tasks had negative impact to Squid.
> Especially: /etc/cron.daily/standard
> and /etc/cron.daily/find
> (see /etc/checksecurity.conf
> and /etc/updatedb.conf
> - don't let find crawl through cache dirs)
>
>
> Some stats from my cachemgr page follow.
> I did not take them in the real peak time,
> unfortunately, but it was
> close to :-)
>
>
> I am happy to post more details if someone is
> interested in.
>
> Best regards,
> have a nice weekend,
>
> Marji
>
>
>
>
> Connection information for squid:
> Number of clients accessing cache: 2925
> Number of HTTP requests received: 13830996
> Number of ICP messages received: 0
> Number of ICP messages sent: 0
> Number of queued ICP replies: 0
> Request failure ratio: 0.00
> Average HTTP requests per minute since start:
> 5128.4
> Average ICP messages per minute since start: 0.0
> Select loop called: 38791775 times, 4.171 ms avg
> Cache information for squid:
> Request Hit Ratios: 5min: 54.0%, 60min: 52.2%
> Byte Hit Ratios: 5min: 23.5%, 60min: 24.7%
> Request Memory Hit Ratios: 5min: 4.9%, 60min: 6.5%
> Request Disk Hit Ratios: 5min: 25.2%, 60min: 26.2%
> Storage Swap size: 161338652 KB
> Storage Mem size: 204820 KB
> Mean Object Size: 22.54 KB
> Requests given to unlinkd: 0
> Median Service Times (seconds) 5 min 60 min:
> HTTP Requests (All): 0.08265 0.10281
> Cache Misses: 0.46965 0.46965
> Cache Hits: 0.01309 0.01164
> Near Hits: 0.42149 0.42149
> Not-Modified Replies: 0.00678 0.00562
> DNS Lookups: 0.01609 0.01464
> ICP Queries: 0.00000 0.00000
> Resource usage for squid:
> UP Time: 161816.436 seconds
> CPU Time: 121702.940 seconds
> CPU Usage: 75.21%
> CPU Usage, 5 minute avg: 94.01%
> CPU Usage, 60 minute avg: 93.22%
> Process Data Segment Size via sbrk(): 915378 KB
> Maximum Resident Size: 0 KB
> Page faults with physical i/o: 935
> Memory usage for squid via mallinfo():
> Total space in arena: 185544 KB
> Ordinary blocks: 183916 KB 9731 blks
> Small blocks: 0 KB 0 blks
> Holding blocks: 6012 KB 10 blks
> Free Small blocks: 0 KB
> Free Ordinary blocks: 1627 KB
> Total in use: 189928 KB 99%
> Total free: 1627 KB 1%
> Total size: 191556 KB
> Memory accounted for:
> Total accounted: 789021 KB
> memPoolAlloc calls: 1795219551
> memPoolFree calls: 1772798798
> File descriptor usage for squid:
> Maximum number of file descriptors: 8192
> Largest file desc currently in use: 3489
> Number of file desc currently in use: 3222
> Files queued for open: 1
> Available number of file descriptors: 4969
> Reserved number of file descriptors: 100
> Store Disk files open: 21
> Internal Data Structures:
> 7160517 StoreEntries
> 35656 StoreEntries with MemObjects
> 35457 Hot Object Cache Items
> 7158519 on-disk objects
>

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Received on Sat Jan 15 2005 - 16:36:03 MST