Andrea Arcangeli wrote:
>
> On Fri, Jul 06, 2001 at 12:28:15AM +1000, Andrew Morton wrote:
> > ext3 journals data. That's unique and it breaks things (or rather,
> > things break it). It'd be trivial to support O_DIRECT in ext3's
> > writeback mode (metadata-only), but nobody uses that.
>
> I
On Fri, Jul 06, 2001 at 12:28:15AM +1000, Andrew Morton wrote:
> ext3 journals data. That's unique and it breaks things (or rather,
> things break it). It'd be trivial to support O_DIRECT in ext3's
> writeback mode (metadata-only), but nobody uses that.
I thought everybody uses metadata-only t
Andrea Arcangeli wrote:
>
> Andrew Morton took care of ext3 O_DIRECT support (included into the ext3
> patch and conditional to #ifdef KERNEL_HAS_O_DIRECT that he asked me to
> add to the latest o_direct patches). (you know O_DIRECT is 99% common
> code, so supporting new fs is almost a no braine
On Fri, Jun 29, 2001 at 10:50:15AM +0100, Alan Cox wrote:
> > the boss say "If Linux makes Sybase go through the page cache on
> > reads, maybe we'll just have to switch to Solaris. That's
> > a serious performance problem."
>
> Thats something you'd have to benchmark. It depends on a very large
On Fri, Jun 29, 2001 at 02:39:00AM -0700, Dan Kegel wrote:
> At work I had to sit through a meeting where I heard
> the boss say "If Linux makes Sybase go through the page cache on
> reads, maybe we'll just have to switch to Solaris. That's
> a serious performance problem."
> All I could say was
Hi,
On Tue, Jul 03, 2001 at 08:10:39AM -0700, Daryll Strauss wrote:
> I recall hearing about a problem with the md device and raw IO. It was
> something about the block sizes not matching causing performance
> problems. Has anything been done to improve those issues?
The problem is a combinatio
On Tue, Jul 03, 2001 at 10:42:53AM +0100, Stephen C. Tweedie wrote:
> On Fri, Jun 29, 2001 at 02:39:00AM -0700, Dan Kegel wrote:
>
> > It supports raw partitions, which is good; that might satisfy my
> > boss (although the administration will be a pain, and I'm not
> > sure whether it's really su
Hi,
On Fri, Jun 29, 2001 at 02:39:00AM -0700, Dan Kegel wrote:
> It supports raw partitions, which is good; that might satisfy my
> boss (although the administration will be a pain, and I'm not
> sure whether it's really supported by Dell RAID devices).
All block devices support raw IO --- the
XFS supports O_DIRECT on linux, has done for a while.
Steve
> At work I had to sit through a meeting where I heard
> the boss say "If Linux makes Sybase go through the page cache on
> reads, maybe we'll just have to switch to Solaris. That's
> a serious performance problem."
> All I could say
>
> Alan Cox wrote:
> >
> > > the boss say "If Linux makes Sybase go through the page cache on
> > > reads, maybe we'll just have to switch to Solaris. That's
> > > a serious performance problem."
> >
> > Thats something you'd have to benchmark. It depends on a very large number
> > of factors
Dan Kegel <[EMAIL PROTECTED]> writes:
>
> And what are the chances Sybase will support that flag any time
> soon? I just read on news://forums.sybase.com/sybase.public.ase.linux
When Sybase always submits its buffers block aligned (same requirement as
for raw io) you can do it with a simple LD_
Alan Cox wrote:
>
> > the boss say "If Linux makes Sybase go through the page cache on
> > reads, maybe we'll just have to switch to Solaris. That's
> > a serious performance problem."
>
> Thats something you'd have to benchmark. It depends on a very large number
> of factors including whether
> the boss say "If Linux makes Sybase go through the page cache on
> reads, maybe we'll just have to switch to Solaris. That's
> a serious performance problem."
Thats something you'd have to benchmark. It depends on a very large number
of factors including whether the database uses mmap, the ave
At work I had to sit through a meeting where I heard
the boss say "If Linux makes Sybase go through the page cache on
reads, maybe we'll just have to switch to Solaris. That's
a serious performance problem."
All I could say was "I expect Linux will support O_DIRECT
soon, and Sybase will support t
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