Re: About QUOTA support in stock kernel (resent)

Hi, I would like to know why quota is not enabled in the stock kernel.. I remembered that it is not enabled since freebsd 3.5 or freebsd 4 generation. Now in freebsd 9.0, it still neeed a kernel rebuild. I have heard it has performance issue (GIANT lock) about quota. Regards, Patrick --- On

Re: About QUOTA support in stock kernel (resent)

On Tue, Dec 25, 2012 at 09:34:30PM +0800, Patrick Dung wrote: > Hi, > > I would like to know why quota is not enabled in the stock kernel.. > > I remembered that it is not enabled since freebsd 3.5 or freebsd 4 generation. > Now in freebsd 9.0, it still neeed a kernel rebuild. > > I have heard i

Re: About QUOTA support in stock kernel (resent)

On 25 December 2012 10:07, Konstantin Belousov wrote: > Enabling quota by default would cause small overhead, like one mutex acquire, > for each inode and block alloc/dealloc, even for mount without quotas enabled. Why is this, and can it be avoided (for mounts without quotas)? > Might be, it is

Re: About QUOTA support in stock kernel (resent)

On Tue, Dec 25, 2012 at 10:23:26AM -0500, Eitan Adler wrote: > On 25 December 2012 10:07, Konstantin Belousov wrote: > > Enabling quota by default would cause small overhead, like one mutex > > acquire, > > for each inode and block alloc/dealloc, even for mount without quotas > > enabled. > > W

Re: looking for someone to fix humanize_number (test cases included)

On Mon, Dec 24, 2012 at 12:00:01PM +, freebsd-hackers-requ...@freebsd.org wrote: > Date: Sun, 23 Dec 2012 00:32:20 -0800 > From: John-Mark Gurney > To: hack...@freebsd.org > Subject: looking for someone to fix humanize_number (test cases > included) > Message-ID: <20121223083220.gl1...@

Re: looking for someone to fix humanize_number (test cases included)

On Tue, Dec 25, 2012 at 07:20:37AM -1000, Clifton Royston wrote: > On Mon, Dec 24, 2012 at 12:00:01PM +, freebsd-hackers-requ...@freebsd.org > wrote: > > From: John-Mark Gurney > > To: hack...@freebsd.org > > Subject: looking for someone to fix humanize_number (test cases > > included) >

Re: looking for someone to fix humanize_number (test cases included)

On Tue, Dec 25, 2012 at 08:23:55AM -1000, Clifton Royston wrote: > On Tue, Dec 25, 2012 at 07:20:37AM -1000, Clifton Royston wrote: > > On Mon, Dec 24, 2012 at 12:00:01PM +, > > freebsd-hackers-requ...@freebsd.org wrote: > > > From: John-Mark Gurney > > > To: hack...@freebsd.org > > > Subject

Re: looking for someone to fix humanize_number (test cases included)

On 25 December 2012 14:46, Clifton Royston wrote: >> I correct myself: the function works fine, and there are no bugs I > could find, though it's clear the man page could emphasize the correct > usage a bit more. Can you submit a diff to the man page as well? I figure if you got confused at lea

Re: FreeBSD for serious performance?

> Which device drivers?  We can't fix problems we don't know about. ata(4) completely hung the system for 19 minutes (at which point I manually intervened, see the PR), probably an infinite loop. http://www.freebsd.org/cgi/query-pr.cgi?pr=170675 Siis(4) and ahci(4) have also caused data loss, pr

Re: FreeBSD for serious performance?

Hi, If the driver is doing something daft like DELAY(x) in a fast interrupt handler which would lead to that behaviour, it should be fixed. If it's doing a DELAY(x) in a critical section, it shuld be fixed. Otherwise, a DELAY(x) in a driver only chews CPU; the scheduler can preempt that. I don't

Re: About QUOTA support in stock kernel (resent)

I am curious if other operating systems have this performance impact. Could we have some workaround or need some code improvement? For example: Do the checking/accounting only if the specific mount point has enabled quota. etc.. Regards, Patrick --- On Tue, 12/25/12, Konstantin Belousov wrote: