On Sun, Jun 10, 2007, Pablo Garc?a wrote: > The objects being cached are 32K at most, > this is the busiest line of iostat -x I got > > avg-cpu: %user %nice %sys %iowait %idle > 2.49 0.00 1.99 22.39 73.13 > > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s > avgrq-sz avgqu-sz await svctm %util > ida/c0d0 0.00 35.64 14.85 3.96 182.18 1148.51 91.09 574.26 > 70.74 3.89 16.32 8.68 16.34 > ida/c0d1 0.00 58.42 36.63 10.89 435.64 570.30 217.82 285.15 > 21.17 0.81 16.56 6.98 33.17 Thats pretty busy; look at the writes. Writing 32kbyte objects to disk is ~2mbytes/sec write, assuming 100% cachability rate. See if you can figure out what's using up the disk IO on that disk(s). The other alternative is to use COSS for the small objects.. Adrian > > This is a partial run for vmstat > > vmstat 1 > procs -----------memory---------- ---swap-- -----io---- --system-- > ----cpu---- > r b swpd free buff cache si so bi bo in cs us sy id > wa > 1 0 208 14528 105372 293208 0 0 75 58 0 7 1 1 88 > 10 > 0 1 208 15168 105288 292512 0 0 400 276 1508 715 2 1 74 > 22 > 0 0 208 14784 105324 292996 0 0 392 0 1541 932 3 1 79 > 18 > 0 0 208 15296 105200 292600 0 0 580 0 1694 1408 3 3 63 > 30 > 0 0 208 14912 105252 292808 0 0 304 0 1598 869 3 2 77 > 19 > 0 2 208 14592 105332 292988 0 0 400 0 1538 971 3 1 70 > 26 > 0 0 208 15552 105284 291996 0 0 348 972 1658 970 3 2 61 > 34 > 0 0 208 14976 105340 292720 0 0 568 0 1710 1158 4 2 68 > 26 > 0 2 208 14528 105400 292920 0 0 408 0 1615 965 3 1 75 > 22 > 0 0 208 14976 105252 292808 0 0 524 0 1644 1074 4 2 70 > 24 > 0 2 208 14592 105296 293024 0 0 376 0 1627 999 3 2 73 > 23 > > > It doesn't seems so busy, any ideas ? > > Best Regards, Pablo > > > > > > > > > > >On 6/8/07, Adrian Chadd <adrian@xxxxxxxxxxxxxxx> wrote: > >> On Fri, Jun 08, 2007, Pablo Garc?a wrote: > >> > Hi, is there any scenario, where I can find this message in the > >> > cache.log for that amount of requests ? What I'm doing wrong ? > >> > squidaio_queue_request: WARNING - Queue congestion > >> > > >> > > >> > Running as reverse proxy > >> > 2 scsi disks with cache_dir configured at 60% of the size > >> > ext3 mounted with noatime > >> > REDHAT kernel 2.6.9-55.ELsmp (4 Update 5) > >> > 2 x Pentium III 1Ghz. 1Gb RAM > >> > access_log none > >> > cache_store_log none > >> > cache_mem 256 Mb > >> > > >> > > >> > CPU at 16% IOWAIT, 4% USER and 2,6% SYSTEM > >> > 60 client req/sec, 70% hit Ratio. > >> > >> Well, you haven't given the one actual bit of info you need, which is IO > >> throughput. Run "vmstat 1" and "iostat 1", look at the device IO. > >> Are your objects big or small? If they're big then each object is going > >> to generate a whole lot more IO than smaller objects, hence the queue > >> congestion. > >> > >> > >> > >> ADrian > >> > >> > > -- - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Support - - $25/pm entry-level bandwidth-capped VPSes available in WA -
