Your message dated Sat, 11 May 2024 22:36:07 +0200
with message-id <zj_wtyn_prhrt...@aurel32.net>
and subject line Re: Bug#1053241: glibc: please apply upstream patch to fix
slow fstat
has caused the Debian Bug report #1053241,
regarding glibc: please apply upstream patch to fix slow fstat
to be marked as done.
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1053241: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1053241
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--- Begin Message ---
Package: glibc
Version: 2.36-9+deb12u1
Severity: normal
X-Debbugs-Cc: pedretti.fa...@gmail.com
Dear Maintainer,
glibc uses a slow version of fstat. Details are documented
here: https://lwn.net/Articles/944214/
A patch to fix this was merged in glibc:
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=551101e8240b7514fc646d1722f8b79c90362b8f
The patch applies cleanly and builds fine also on bookworm glibc.
Please consider apply it to fix slow fstat.
Thanks.
--- End Message ---
--- Begin Message ---
Version: 2.39-1
On 2023-11-26 18:19, Fabio Pedretti wrote:
> Il giorno dom 26 nov 2023 alle ore 16:28 Aurelien Jarno
> <aure...@debian.org> ha scritto:
> >
> > Hi,
> >
> > On 2023-09-29 21:52, Fabio Pedretti wrote:
> > > Package: glibc
> > > Version: 2.36-9+deb12u1
> > > Severity: normal
> > > X-Debbugs-Cc: pedretti.fa...@gmail.com
> > >
> > > Dear Maintainer,
> > >
> > > glibc uses a slow version of fstat. Details are documented
> > > here: https://lwn.net/Articles/944214/
> > >
> > > A patch to fix this was merged in glibc:
> > > https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=551101e8240b7514fc646d1722f8b79c90362b8f
> > >
> > > The patch applies cleanly and builds fine also on bookworm glibc.
> > > Please consider apply it to fix slow fstat.
> >
> > This patch changes the syscall used by binaries, so it has to be
> > considered with a lot of care in a stable release, it could break
> > existing seccomp filters. In any case it has to live a few months in
> > testing/unstable first.
> >
> > Note that the kernel patch that improves the performance of fstatat, has
> > not been merge to the upstream stable tree, nor to bookworm.
> >
> > In order to better understand the need for this patch in bookworm, could
> > you please give some details about your workload and the performance
> > impact it has?
>
> I did some test with my use case, borg backup with many unchanged
> files, see https://github.com/borgbackup/borg/issues/4498 for some
> background and system calls impact, where borg 1.2 slow downs a lot
> vs. borg 1.1.
>
> I checked using strace the patch, it did the job (newfstatat calls
> were replaced with fstat), and I'd hoped that it would improve
> performance, however my use case improved just marginally (difficult
> to have reproducible data in my case, but it was like 5%).
>
> I didn't notice any other regression, however.
>
> I see the glibc patch is still only on 2.39, while even Debian
> experimental has just 2.38.
Debian experimental now has version 2.39, closing the bug accordingly.
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
aurel...@aurel32.net http://aurel32.net
--- End Message ---
