Date: Fri, 5 Oct 2012 07:50:16 -0400 (EDT) From: Darrel <levitch@iglou.com> To: Sergey Kandaurov <pluknet@gmail.com> Cc: current@freebsd.org Subject: Re: memory warnings r240891 | dmesg Message-ID: <alpine.GSO.2.00.1210050742140.24924@shell1> In-Reply-To: <CAE-mSOJUYCtzEQZzj2gm=fBUsqA8EsXA99fzp7KQe-=urc0Lbg@mail.gmail.com> References: <alpine.GSO.2.00.1210041212060.1991@shell1> <CAE-mSOJUYCtzEQZzj2gm=fBUsqA8EsXA99fzp7KQe-=urc0Lbg@mail.gmail.com>
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>> (30) @ 12:01:50> swapinfo >> Device 1K-blocks Used Avail Capacity >> /dev/zvol/bigD/swap 4194304 0 4194304 0% >> /dev/gpt/swap0.eli 3145728 0 3145728 0% >> /dev/gpt/swap1.eli 3145728 0 3145728 0% >> Total 10485760 0 10485760 0% > [...] >> ************************************************************* >> FreeBSD 10.0-CURRENT #1 r240891: Tue Sep 25 00:51:03 EDT 2012 >> warning: increase kern.maxswzone or reduce amount of swap. >> >> ************************************************************* >> >> Apparently kern.maxswzone is currently equal to 0. How might I tweak it >> just enough to fix this? > > So, reduce amount of swap :) > > This is because kernel needs some memory to manage swap too. > Currently for amd64 this roughly reduces to the following rule > (My apologies in advance for the extra simplification): > > 100MB RAM per 800MB swap space. > > So, with your current amount of RAM (893MB) it is recommended to setup > no more than 7144 MB of swap. [1] > Thanks for the good ideas. Thus far, # zfs get volsize bigD/swap NAME PROPERTY VALUE SOURCE bigD/swap volsize 4G local # zfs set volsize=1100m bigD/swap # zfs get volsize bigD/swap NAME PROPERTY VALUE SOURCE bigD/swap volsize 1.07G local (73) @ 6:55:44> swapinfo -h Device 1K-blocks Used Avail Capacity /dev/#C:0x6c 4194304 808k 4G 0% /dev/gpt/swap0.eli 3145728 772k 3G 0% /dev/gpt/swap1.eli 3145728 800k 3G 0% Total 10485760 2.3M 10G 0% - yes, it appeared that something weird happened to the file name # zfs destroy -V bigD/swap - file in use or some error # reboot # swapinfo -h Device 1K-blocks Used Avail Capacity /dev/zvol/bigD/swap 1126400 0B 1.1G 0% /dev/gpt/swap0.eli 3145728 0B 3.0G 0% /dev/gpt/swap1.eli 3145728 0B 3.0G 0% Total 7417856 0B 7.1G 0% So the zvol swap size was reduced, but the swzone error still exists. Also, the zfs create and destroy commands availed nothing- perhaps there were subsequent or subcommands to run there. Is there a good method to reduce the encrypted swap, perhaps? I might like to have a total of 3g encrypted swap plus 3g zvol swap. Darrel
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