Re: [squid-users] slower connections using squid (squid is slowing down all connections)

Hi Chris,

> > Also, i have:
> > Last 5 minutes:
> > client_http.requests = 2.723098/sec
> > client_http.hits = 0.779933/sec
>
> Well, the box is not being stressed... What is the output of "hdparm -t
> /dev/sda" (I think SATA shows up as SCSI in linux)?

# cat /proc/partitions
major minor #blocks name

   8 0 120059840 sda
   8 1 104391 sda1
   8 2 1 sda2
   8 5 2008093 sda5
   8 6 117941166 sda6

# hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 170 MB in 3.03 seconds = 56.15 MB/sec
[root@ns1 ~]# hdparm -tT /dev/sda

# hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads: 3792 MB in 2.00 seconds = 1896.29 MB/sec
 Timing buffered disk reads: 156 MB in 3.02 seconds = 51.73 MB/sec
[root@ns1 ~]#

I am using 2 sata HDD drives mounted in RAID1 hardware controller (3ware - 2
ports)

Timings above are ok or not?

> If I set the BIOS to
> use the SATA drives in "Enhanced" (both SATA and PATA drives are available)
> or "SATA Only", I get very poor performance. Only if I set them as
> "Combined" (the SATA drives "act" like a PATA channel) do I get decent
> performance.
>
I can't access BIOS settings now (require to stop our services)... Only
tonight, when our network will be free... I will do it only if speed above is
poor ....

> I see nothing in here that would be causing the horrid performance that you
> are reporting. What do the Median Service Times (under the General Runtime
> Info) look like?

I increased cache_mem from 32 MB to 256MB and nothing seems to change my
life ... as you said, the box is not being stressed anyway.... Now, I have
only 138 clients accessing cache and squid is working worse then a dial-up
connection. Here comes General Runtime Info including Median Service Times
too...

Connection information for squid:
 Number of clients accessing cache: 135
 Number of HTTP requests received: 82681
 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: 62.4
 Average ICP messages per minute since start: 0.0
 Select loop called: 22219278 times, 3.579 ms avg
Cache information for squid:
 Request Hit Ratios: 5min: 34.3%, 60min: 38.8%
 Byte Hit Ratios: 5min: 4.4%, 60min: 24.5%
 Request Memory Hit Ratios: 5min: 1.0%, 60min: 5.9%
 Request Disk Hit Ratios: 5min: 39.3%, 60min: 32.4%
 Storage Swap size: 4053340 KB
 Storage Mem size: 43480 KB
 Mean Object Size: 17.73 KB
 Requests given to unlinkd: 0
Median Service Times (seconds) 5 min 60 min:
 HTTP Requests (All): 0.01955 0.02317
 Cache Misses: 0.44492 0.35832
 Cache Hits: 0.00865 0.01035
 Near Hits: 0.28853 0.22004
 Not-Modified Replies: 0.01164 0.01035
 DNS Lookups: 0.08717 0.16304
 ICP Queries: 0.00000 0.00000
Resource usage for squid:
 UP Time: 79515.851 seconds
 CPU Time: 387.250 seconds
 CPU Usage: 0.49%
 CPU Usage, 5 minute avg: 0.24%
 CPU Usage, 60 minute avg: 0.17%
 Process Data Segment Size via sbrk(): 79920 KB
 Maximum Resident Size: 0 KB
 Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
 Total space in arena: 79920 KB
 Ordinary blocks: 79544 KB 3201 blks
 Small blocks: 0 KB 0 blks
 Holding blocks: 1784 KB 3 blks
 Free Small blocks: 0 KB
 Free Ordinary blocks: 375 KB
 Total in use: 81328 KB 100%
 Total free: 375 KB 0%
 Total size: 81704 KB
Memory accounted for:
 Total accounted: 65164 KB
 memPoolAlloc calls: 11051188
 memPoolFree calls: 10437330
File descriptor usage for squid:
 Maximum number of file descriptors: 1024
 Largest file desc currently in use: 140
 Number of file desc currently in use: 130
 Files queued for open: 0
 Available number of file descriptors: 894
 Reserved number of file descriptors: 100
 Store Disk files open: 0
Internal Data Structures:
 228996 StoreEntries
   6823 StoreEntries with MemObjects
   6819 Hot Object Cache Items
 228639 on-disk objects

Alex
Received on Fri Sep 23 2005 - 00:26:22 MDT