[haiku-bugs] Re: [Haiku] #5737: Installer does not enable virtual memory by default?
- From: "stippi" <trac@xxxxxxxxxxxx>
- Date: Mon, 26 Apr 2010 10:35:34 -0000
#5737: Installer does not enable virtual memory by default?
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Reporter: andreasf | Owner: korli
Type: bug | Status: new
Priority: normal | Milestone: R1/alpha2
Component: Applications/Installer | Version: R1/Development
Keywords: | Blockedby:
Platform: x86 | Blocking:
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Comment(by stippi):
First of all, the Installer has nothing to do with this. There are three
things which can have an influence:
1) Swap support can be disabled at build time, via the
kernel_debug_config.h file in build/config_headers or
build/user_config_headers, the default of ENABLE_SWAP_SUPPORT is 1, so it
has to be turned off deliberately, but I don't assume this is done on the
Build-O-Matic machine.
2) src/system/kernel/vm/VMAnonymousCache.cpp reads the "virtual_memory"
kernel settings file in swap_init_post_modules(). The file either exists
or it does not exist. In the case that it does not exist, the system tries
to allocate a swap file that is twice the ammount of physical memory.
Which can of course easily fail if there is not enough room on the boot
partition. This may actually be your situation, in case you installed
Alpha 2 on a dedicated partition which is too small, or if you installed
it on your regular partition, but Alpha 2 comes with more stuff and again
the partition is too small.
3) If a user has run the VirtualMemory preflet, then the kernel settings
file exists. By default, it turns virtual memory on ("vm on").
Can you please check which situation could apply in your case? I agree
that running without swap space can have bad consequences on system
behavior, so perhaps allocating a dynamic swap file in
swap_init_post_modules() that only spans a certain percentage of the free
space on the boot disk is a better idea then to fail completely. This
would then be the proper fix for this ticket, in case it's really your
situation, but it would deserve a fix in either case.
--
Ticket URL: <http://dev.haiku-os.org/ticket/5737#comment:1>
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