From: Jens Axboe <jens.axboe@oracle.com>
To: Daniel Drake <ddrake@brontes3d.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: splice blocks indefinitely when len > 64k?
Date: Mon, 30 Oct 2006 20:54:27 +0100 [thread overview]
Message-ID: <20061030195426.GO14055@kernel.dk> (raw)
In-Reply-To: <1162226390.7280.18.camel@systems03.lan.brontes3d.com>
On Mon, Oct 30 2006, Daniel Drake wrote:
> Hi,
>
> I'm experimenting with splice and have run into some unusual behaviour.
>
> I am using the utilities in git://brick.kernel.dk/data/git/splice.git
>
> In splice.h, when changing SPLICE_SIZE from:
>
> #define SPLICE_SIZE (64*1024)
>
> to
>
> #define SPLICE_SIZE ((64*1024)+1)
>
> splice-cp hangs indefinitely when copying files sized 65537 bytes or
> more. It hangs on the first splice() call.
>
> Is this a bug? I'd like to be able to copy much more than 64kb on a
> single splice call.
You can't, internally splice is using a pipe which is currently confined
to 16 pages. The SPLICE_SIZE define isn't a suggestion in the code, it
reflects that. You could fix splice-cp to not stall on changing that,
however that still doesn't change the fact that you can only move chunks
of 64kb (on your arch) right now.
--
Jens Axboe
next prev parent reply other threads:[~2006-10-30 19:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-30 16:39 splice blocks indefinitely when len > 64k? Daniel Drake
2006-10-30 19:11 ` Phillip Susi
2006-10-30 19:32 ` Daniel Drake
2006-10-30 19:55 ` Jens Axboe
2006-10-30 19:54 ` Jens Axboe [this message]
2006-10-30 21:08 ` Stephen Hemminger
2006-10-31 7:27 ` Jens Axboe
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