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Date: Sat, 7 Aug 2010 16:20:03 GMT
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To: freebsd-bugs@FreeBSD.org
From: Vernon Schryver <vjs@calcite.rhyolite.com>
Cc: 
Subject: Re: kern/149323: [libc] Applications with large memory footprint
	failing with mmap(2) - memory allocation errors
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The following reply was made to PR kern/149323; it has been noted by GNATS.

From: Vernon Schryver <vjs@calcite.rhyolite.com>
To: bug-followup@FreeBSD.org
Cc: rblayzor@inoc.net
Subject: Re: kern/149323: [libc] Applications with large memory footprint failing with mmap(2) - memory allocation errors
Date: Sat, 7 Aug 2010 16:17:14 GMT

 The problem does not happen with clean install of i386 Freebsd 8.1
 and DCC 2.3.131 on a 32-bit box with 4 GByte of RAM less about 500 MByte
 of PCI window.
 
 The problem does happen after creating /boot/loader.conf.local containing
 kern.maxdsiz="2048M" and rebooting.  It happens when the dccd process
 reaches about 880 MBytes of mmap()'ed windows into /var/dcc/dcc_db and
 /var/dcc/dcc_db.hash.
 
 `sysctl kern.maxdsiz` on my test system says "kern.maxdsiz: 536870912"
 without /boot/loader.conf.local but "kern.maxdsiz: 2147483648" with
 the file.
 
 The message 
   try #1 mmap(dcc_db 0xeee000,0x3,0x801,11,0x49b72000): Cannot allocate memory
 means that mmap(0, 0xeee000,0x3,0x801,11,0x49b72000) returned ENOMEM
 where FD 11 is the file .../dcc_db
 The message "try #2 mmap(...) ok" means that mmap() worked after releasing
 some mmap()'ed memory.
 
 I don't remember whether setting kern.maxdsiz was once needed to run
 a DCC server on FreeBSD.  As far as I know it is not needed now.
 
 Evidently something happened to the effects of kern.maxdsiz between
 FreeBSD 7.3 and 8.1
 
 Perhaps the bug can be fixed by merely documenting the new effects of
 kern.maxdsiz
 
 
 Vernon Schryver    vjs@rhyolite.com