Date: Fri, 12 Jan 2007 23:27:53 -0200 (BRST) From: "Michel Santos" <michel@lucenet.com.br> To: freebsd-performance@freebsd.org Subject: diskio low read performance Message-ID: <64656.200.152.83.36.1168651673.squirrel@webmail.matik.com.br>
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I hope somebody can help me. I upgraded recently my cache server (squid) 4.11 to 6.2 I notice that my disk read performance seems to be low. I observe it by reading diskio from net-snmp. I started to check this because my old server gave much better results from cache. I see read access as 1/4 - 1/6 of write access. My cache_dirs are full and no swap in use. IOLA is not over 25-30 in peaks is there some special configuration to get better read performance on 6.2? My disks are UW320 10k on Adaptec 29320 and the same as on the 4.11 server. I really dont care about write speed so much so if there are parameters to configure I apreciate to hear about. I checked the following with 1 and 0 but it does not make any difference at all vfs.write_behind vfs.vmiodirenable I get an average of 6-8Mb/s through this server and 3-4 of it is http traffic. I see the object are going into the cache but for some reason it seems they can not be read in time. I tried different newfs -b and -f and actually 1024/4096 seems to be best. I do not cache large files on this machine. Is there something I sgould try? Michel computador é como nem cavalo e mulher mais que montam neles, pior que ficam ... **************************************************** Datacenter Matik http://datacenter.matik.com.br E-Mail e Data Hosting Service para Profissionais. ****************************************************
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