From: Hans Reiser <reiser@namesys.com>
To: Nix <nix@esperi.org.uk>
Cc: Andrew Morton <akpm@osdl.org>,
"Vladimir V. Saveliev" <vs@namesys.com>,
hch@infradead.org, Reiserfs-Dev@namesys.com,
Linux-Kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: batched write
Date: Mon, 19 Jun 2006 02:05:21 -0700 [thread overview]
Message-ID: <449668D1.1050200@namesys.com> (raw)
In-Reply-To: <87ac8an21r.fsf@hades.wkstn.nix>
Nix wrote:
>On 17 Jun 2006, Hans Reiser prattled cheerily:
>
>
>>If the FS is called per page, then it turns out that 3) costs more than
>>1) and 2) for sophisticated filesystems. As we develop fancier and
>>fancier plugins this will just get more and more true. It decreases CPU
>>usage by 2x to use per sys_write calls into reiser4 rather than per page
>>calls into reiser4.
>>
>>
>
>This seems to me to be something that FUSE filesystems might well like,
>too: I know one I'm working on would like to know the real size of the
>original write request (so that it can optimize layout appropriately
>for things frequently written in large chunks; the assumption being that
>if it's written in large chunks it's likely to be read in large chunks
>too).
>
>
>
Hi Nix,
Forgive myn utter ignorance of fuse, but does it currently context
switch to user space for every 4k written through VFS?
next prev parent reply other threads:[~2006-06-19 9:05 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <44736D3E.8090808@namesys.com>
[not found] ` <20060524175312.GA3579@zero>
[not found] ` <44749E24.40203@namesys.com>
[not found] ` <20060608110044.GA5207@suse.de>
[not found] ` <1149766000.6336.29.camel@tribesman.namesys.com>
[not found] ` <20060608121006.GA8474@infradead.org>
2006-06-14 22:08 ` batched write Vladimir V. Saveliev
2006-06-17 17:04 ` Andrew Morton
2006-06-17 17:51 ` Hans Reiser
2006-06-18 11:20 ` Nix
2006-06-19 9:05 ` Hans Reiser [this message]
2006-06-19 11:32 ` Miklos Szeredi
2006-06-19 16:39 ` Hans Reiser
2006-06-19 17:35 ` Miklos Szeredi
2006-06-19 17:52 ` Akshat Aranya
2006-06-19 20:39 ` Hans Reiser
2006-06-19 16:27 ` Andreas Dilger
2006-06-19 16:51 ` Hans Reiser
2006-06-19 18:50 ` Andreas Dilger
2006-06-19 20:47 ` Hans Reiser
2006-06-20 0:01 ` David Chinner
2006-06-20 7:19 ` Hans Reiser
2006-06-20 7:26 ` Andrew Morton
2006-06-20 9:02 ` Steven Whitehouse
2006-06-20 16:26 ` Vladimir V. Saveliev
2006-06-20 17:29 ` Hans Reiser
2006-06-19 18:28 ` Vladimir V. Saveliev
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