* Warner Losh <[EMAIL PROTECTED]> [010122 13:09] wrote:
> In message <[EMAIL PROTECTED]> Alfred Perlstein writes:
> : > Yes, this looks to be much closer to the interface I really wanted
> : > anyway. I see no man pages for them. Is there any doc anywhere? "Read
> : > the source and look at exi
> If busdma is "pretty broken" for network-sized requests, I may just
> avoid it for now, implement the contigmalloc cache, and move on to more
> interesting problems.
It's broken for network-sized requests because it uses contigmalloc. 8)
The cache approach will work equally well for either int
> > > there's a problem because there's no busdma for mbufs (well
> > > actually there is but it fails on really small unaligned blocks
> > > which basically breaks it for mbufs).
> >
> > Can you tell me more about this hazard? I can't control the
> > alignment that's asked for by the driver, but
In message <[EMAIL PROTECTED]> Alfred Perlstein writes:
: > Yes, this looks to be much closer to the interface I really wanted
: > anyway. I see no man pages for them. Is there any doc anywhere? "Read
: > the source and look at existing examples" will do if it must but any
: > pointers to bette
* Robert Lipe <[EMAIL PROTECTED]> [010122 12:50] wrote:
> Alfred Perlstein wrote:
>
> > > So if I sandbagged the allocs to be *larger* the KMA would behave more
> > > consistently with what I'd expect becuase it would then reclaim? I
> > > didn't see that one coming. :-)
> >
> > but... this is
Alfred Perlstein wrote:
> > So if I sandbagged the allocs to be *larger* the KMA would behave more
> > consistently with what I'd expect becuase it would then reclaim? I
> > didn't see that one coming. :-)
>
> but... this is a terrible workaround, I'm not sure it would work
> and you shouldn't
> > Is there an s/g memory interface in FreeBSD? This was my first choice,
> > but since I couldn't find a set of functions to build a list of buffers
> > that satisfied a set of constraints, I fell back to contigmalloc to get
> > things off the ground. I'd be delighted to use an interface to ge
> Aaaah. There's a hint. Yes, by the time we get into trouble, I've
> allocated (and freed) several thousand chunks that are < PAGE_SIZE/2.
> This is happening in periods of a few dozen. (I don't know the number,
> but I think it's 48 or 64.) The test program allocates a few dozen tx
> buffers,
* Robert Lipe <[EMAIL PROTECTED]> [010122 11:21] wrote:
> > > In this case, the resource failure isn't temporary. Once it starts
> > > failing, it fails until the system is rebooted. Since this is on a
> > > dedicated thread, I could handle it if it really was temporary. Of
> > > course, puttin
> I'm calling contigmalloc() with M_WAITOK. For every contigmalloc, I
> have a corresponding contigfree(). But after a few thousand cycles,
> contigmalloc() starts returning NULL. It self-destructs in about 3
> minutes. I see the same behaviour with M_NOWAIT. As an aside, WAITOK's
> should ne
> > In this case, the resource failure isn't temporary. Once it starts
> > failing, it fails until the system is rebooted. Since this is on a
> > dedicated thread, I could handle it if it really was temporary. Of
> > course, putting me to sleep so that someone else (or even another of my
> > ow
* Robert Lipe <[EMAIL PROTECTED]> [010122 10:39] wrote:
> Alfred Perlstein wrote:
> > * Robert Lipe <[EMAIL PROTECTED]> [010122 09:04] wrote:
>
> > Memory get's fragmented, there's not much you can do about it. I
> > doubt that contigmalloc respects the WAITOK flag, there's a good
> > chance tha
Alfred Perlstein wrote:
> * Robert Lipe <[EMAIL PROTECTED]> [010122 09:04] wrote:
> > I'm calling contigmalloc() with M_WAITOK. For every contigmalloc, I
> > have a corresponding contigfree(). But after a few thousand cycles,
> > contigmalloc() starts returning NULL. It self-destructs in about
* Robert Lipe <[EMAIL PROTECTED]> [010122 09:04] wrote:
> Hi, Gang.
>
> I know that anytime a message starts with a subject like this, the
> first reaction is to think that I've hosed the heap or am not freeing
> something. While it's possible, I really don't think I have. (I also
> know that e
Hi, Gang.
I know that anytime a message starts with a subject like this, the
first reaction is to think that I've hosed the heap or am not freeing
something. While it's possible, I really don't think I have. (I also
know that everyone thinks that. :-)
I'm on FreeBSD 4.1.1. I've not seen any f
15 matches
Mail list logo
