[bug-mailutils] address@hidden: Bug#214629: mailutils-imap4d: msync forces disk spinup]

[Jordi Mallach]

Hello,

I got this bug report a few weeks ago. It's a weird wishlist for a mail
server, but if it's doable to improve it, he'll be happier :)

Jordi
-- 
Jordi Mallach Pérez  --  Debian developer     http://www.debian.org/
address@hidden     address@hidden     http://www.sindominio.net/
GnuPG public key information available at http://oskuro.net/~jordi/
> --- Begin Message ---
>
>
>
> Subject: 
>
> Bug#214629: mailutils-imap4d: msync forces disk spinup
>
>
>
>
> Date: 
>
> Tue, 07 Oct 2003 21:23:03 +0200
>
>
>
>
> Package: mailutils-imap4d
> Version: 20030902-1
> Severity: minor
>
> I'm using the noflushd utility to keep my computer quiet, by spinning
> down the disks. However, each time someone checks their mail, the disk
> is spinning up.
> Other IMAP servers, for example uw-imapd, does not require the disk to
> spin up.
>
> I think the cause is the msync calls at mailbox/mapfile_stream.c,
> this is a code snippet from function _mapfile_size:
>
>   if (mfs->ptr == MAP_FAILED)
>     return EINVAL;
>   if (mfs->ptr)
>     msync (mfs->ptr, mfs->size, MS_SYNC);
>   if (fstat(mfs->fd, &stbuf) != 0)
>     return errno;
>   if (mfs->size != (size_t)stbuf.st_size)
>
> If it is requred to sync mmap'ed pages before fstat (the man pages do
> not mention anything about this), then there must be some other way to
> flush the pages, without disk access.
>
> -- System Information:
> Debian Release: testing/unstable
> Architecture: i386
> Kernel: Linux saturn 2.4.20 #15 Sat May 3 05:08:04 CEST 2003 i586
> Locale: LANG=C, LC_CTYPE=sv_SE
>
> Versions of packages mailutils-imap4d depends on:
> ii  libc6         2.3.2-8                    GNU C Library: Shared libraries an
> ii  libcomerr2    1.34+1.35-WIP-2003.08.21-3 The Common Error Description libra
> ii  libgcrypt1    1.1.12-4                   LGPL Crypto library - runtime libr
> ii  libgdbm3      1.8.3-2                    GNU dbm database routines (runtime
> ii  libgnutls7    0.8.9-2                    GNU TLS library - runtime library
> ii  libgsasl1     0.0.6-1                    GNU SASL library
> ii  libidn9       0.1.14-2                   GNU libidn library, implementation
> ii  libkrb53      1.3-2                      MIT Kerberos runtime libraries
> ii  libmailutils0 20030902-1                 GNU Mail abstraction library
> ii  libmysqlclien 3.23.56-2                  LGPL-licensed client library for M
> ii  libpam0g      0.76-14                    Pluggable Authentication Modules l
> ii  libtasn1-0    0.1.2-1                    Manage ASN.1 structures (runtime)
> ii  netbase       4.13                       Basic TCP/IP networking system
> ii  zlib1g        1:1.1.4-15                 compression library - runtime
>
> -- no debconf information
>
>
> --- End Message ---