Date: Wed, 13 Apr 2005 20:58:22 +0200 From: =?ISO-8859-2?Q?S=B3awek_=AFak?= <slawek.zak@gmail.com> To: freebsd-hackers@freebsd.org Subject: Performance trouble on AMD64 webserver Message-ID: <787bbe1c050413115849ddb7ce@mail.gmail.com> In-Reply-To: <787bbe1c0504130928208c6057@mail.gmail.com> References: <787bbe1c0504130928208c6057@mail.gmail.com>
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Hi, I've an 2 processor Opteron server (Sun v20z) with 4GB of RAM. It runs FreeBSD 5.4-PRERELEASE. Everything is roses for 1-2 minutes after starting Apache. Then the server freezes for 10-20 seconds then resumes normal operation and chokes every couple of minutes. I tried with 512 and 1024 httpd processes running. It is a fairly dynamic webpage. Apache is coupled with mod_php. Each process takes 18-19MB of resident memory. I was tuning the machine after getting the nefarious "collectng PV entries ..." message. I tried to increase PMAP_SHPGPERPROC and all. It doesn't make the performance better. Snapshot of vmstat -z gives: ... PV ENTRY: 48, 4312872, 1611440, 616384, 8657151 The free value decreases to something close to 0 then the machine chokes to get back up to some large value. My loader.conf: accf_data_load="YES" accf_http_load="YES" kern.ipc.nmbclusters="131072" kern.maxusers="1024" The sysctl.conf: kern.ipc.somaxconn=1024 The customized part of kernel config: options VM_BCACHE_SIZE_MAX="(500*1024*1024)" options MAXDSIZ="(1000*1024*1024)" options MAXSSIZ="(1000*1024*1024)" options DFLDSIZ="(1000*1024*1024)" options PMAP_SHPGPERPROC=4096 options PMAP_SHPGPERPROC=16384 options SHMALL=131072 options SHMMAXPGS=131072 I've also removed lots of SCSI hardware, Wifi and USB parts which I don't need from the GENERIC config. Any Ideas how to make it work? Thanks, /S -- Sławek Żak / UNIX Systems Administratorhelp
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