From: Shawn Pearce <spearce@spearce.org>
To: Junio C Hamano <junkio@cox.net>
Cc: git@vger.kernel.org
Subject: Re: Mozilla .git tree
Date: Sat, 2 Sep 2006 13:44:32 -0400 [thread overview]
Message-ID: <20060902174432.GB27826@spearce.org> (raw)
In-Reply-To: <7vveo6zfx0.fsf@assigned-by-dhcp.cox.net>
Junio C Hamano <junkio@cox.net> wrote:
> Shawn Pearce <spearce@spearce.org> writes:
>
> > Using a 28 byte index entry instead of a 32 byte index entry means
> > the Mozilla historical pack index will only be 52.4 MiB rather than
> > the slightly larger 59.9 MiB.
>
> Yup, that was one consideration. One small worry is we will be
> placing u64 at 4-byte alignment by using 28-byte entries but I
> think that is Ok.
On some systems (SPARC?) that's definately an issue. Other systems
(x86) obviously don't have that problem.
If you code the decode function as treating that 64 bit value as
two 32 bit values in network byte order and combine them together
after ntohl() then this shouldn't be a problem. Though big-endian
systems which can take a u64 on a 4-byte alignment just fine would
pay a small performance penalty that they don't need to pay.
--
Shawn.
--
VGER BF report: S 0.998672
next prev parent reply other threads:[~2006-09-03 9:27 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9e4733910608290943g6aa79855q62b98caf4f19510@mail.gmail.com>
[not found] ` <20060829165811.GB21729@spearce.org>
[not found] ` <9e4733910608291037k2d9fb791v18abc19bdddf5e89@mail.gmail.com>
[not found] ` <20060829175819.GE21729@spearce.org>
[not found] ` <9e4733910608291155g782953bbv5df1b74878f4fcf1@mail.gmail.com>
[not found] ` <20060829190548.GK21729@spearce.org>
[not found] ` <9e4733910608291252q130fc723r945e6ab906ca6969@mail.gmail.com>
[not found] ` <20060829232007.GC22935@spearce.org>
[not found] ` <9e4733910608291807q9b896e4sdbfaa9e49de58c2b@mail.gmail.com>
2006-08-30 1:51 ` Mozilla .git tree Shawn Pearce
2006-08-30 2:25 ` Shawn Pearce
2006-08-30 2:58 ` Jon Smirl
2006-08-30 3:10 ` Shawn Pearce
2006-08-30 3:27 ` Jon Smirl
2006-08-30 5:53 ` Nicolas Pitre
2006-08-30 11:42 ` Junio C Hamano
2006-09-01 7:42 ` Junio C Hamano
2006-09-02 1:19 ` Shawn Pearce
2006-09-02 4:01 ` Junio C Hamano
2006-09-02 4:39 ` Shawn Pearce
2006-09-02 11:06 ` Junio C Hamano
2006-09-02 14:20 ` Jon Smirl
2006-09-02 17:39 ` Shawn Pearce
2006-09-02 18:56 ` Linus Torvalds
2006-09-02 20:53 ` Junio C Hamano
2006-09-02 17:44 ` Shawn Pearce [this message]
2006-09-02 2:04 ` Shawn Pearce
2006-09-02 11:02 ` Junio C Hamano
2006-09-02 17:51 ` Shawn Pearce
2006-09-02 20:55 ` Junio C Hamano
2006-09-03 3:54 ` Shawn Pearce
2006-09-01 17:45 ` A Large Angry SCM
2006-09-01 18:35 ` Linus Torvalds
2006-09-01 19:56 ` Junio C Hamano
2006-09-01 23:14 ` [PATCH] pack-objects: re-validate data we copy from elsewhere Junio C Hamano
2006-09-02 0:23 ` Linus Torvalds
2006-09-02 1:39 ` VGER BF report? Johannes Schindelin
2006-09-02 5:58 ` Sam Ravnborg
2006-09-02 1:52 ` [PATCH] pack-objects: re-validate data we copy from elsewhere Junio C Hamano
2006-09-02 3:52 ` Junio C Hamano
2006-09-02 4:52 ` Shawn Pearce
2006-09-02 9:42 ` Junio C Hamano
2006-09-02 17:43 ` Linus Torvalds
2006-09-02 10:09 ` Junio C Hamano
2006-09-02 17:54 ` Shawn Pearce
2006-09-03 21:00 ` Junio C Hamano
2006-09-04 4:10 ` Shawn Pearce
2006-09-04 5:50 ` Junio C Hamano
2006-09-04 6:44 ` Shawn Pearce
2006-09-04 7:39 ` Junio C Hamano
2006-09-03 0:27 ` Linus Torvalds
2006-09-03 0:32 ` Junio C Hamano
2006-09-05 8:12 ` Junio C Hamano
2006-09-02 18:43 ` Linus Torvalds
2006-09-02 20:56 ` Junio C Hamano
2006-09-03 21:48 ` Junio C Hamano
2006-09-03 22:00 ` Linus Torvalds
2006-09-03 22:16 ` Linus Torvalds
2006-09-03 22:34 ` Junio C Hamano
2006-09-04 4:06 ` Junio C Hamano
2006-09-04 15:19 ` Linus Torvalds
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20060902174432.GB27826@spearce.org \
--to=spearce@spearce.org \
--cc=git@vger.kernel.org \
--cc=junkio@cox.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).