On Thu, Mar 18, 2021 at 01:36:55AM -, SaveTheRbtz wrote:
> Is it possible (pun intended) to compromise on
> `CONFIG_SQUASHFS_DECOMP_MULTI` (which uses num_online_cpus) instead of
> `CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU` (which uses `num_possible_cpus`)?
It's better, but still not that great of
Is it possible (pun intended) to compromise on
`CONFIG_SQUASHFS_DECOMP_MULTI` (which uses num_online_cpus) instead of
`CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU` (which uses `num_possible_cpus`)?
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@SaveTheRbtz I did get to the cause, and added a lot of notes about it
in the comments for this bug. I even wrote some code to provide a more
balanced compromise between memory usage and performance, but once the
memory issues were alleviated it seems no one cared about it enough to
even try out th
The log message[1] says that this issues is under investigation:
> For the moment turn it off while it can be investigated.
Did we find the root cause? Seems like Debian is successfully uses it nowadays:
```
tar -xOzf linux_5.10.19-1.debian.tar.xz ./debian/config/config | fgrep
CONFIG_SQUASHFS_D
** Changed in: snappy
Status: In Progress => Fix Released
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Title:
unexpectedly large memory usage of mounted snaps
To manage notification
This bug was fixed in the package linux - 4.8.0-30.32
---
linux (4.8.0-30.32) yakkety; urgency=low
* CVE-2016-8655 (LP: #1646318)
- packet: fix race condition in packet_set_ring
-- Brad Figg Thu, 01 Dec 2016 08:02:53 -0800
** Changed in: linux (Ubuntu Zesty)
Status:
** Changed in: snappy
Status: New => In Progress
** Changed in: snappy
Importance: Undecided => Critical
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Title:
unexpectedly large me
This bug was fixed in the package linux - 4.8.0-28.30
---
linux (4.8.0-28.30) yakkety; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1641083
* lxc-attach to malicious container allows access to host (LP: #1639345)
- Revert "UBUNTU: SAUCE: (noup) ptrace:
Thanks for the responses, that explains the strange results on the
single CPU system. Have you had a chance to try the new kernels yet?
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Title:
u
Hey Seth.
To reply to your earlier question:
@zyga: I'm honestly very surprised that the config change had that
drastic an impact on the single-CPU system. Can you tell me what 'cat
/sys/devices/system/cpu/possible' says on that system?
This was in a virtual machine with one CPU and the file lis
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
yakkety' to 'verification-done-yakkety'.
If verification is not done by 5 working days from
Observations from some very unscientific testing. Testing was done with
fio using 8 parallel jobs doing random reads in an amd64 VM with 8
cores.
* The kernel in comment #10 and 4.4.0-45 (with
SQUASHFS_DECOMP_MULTI_PERCPU) performed comparably for the most part.
4.4.0-47 (with CONFIG_SQUASHFS_DECO
Regarding #2 in comment #8 - I found that we can more or less do this
with few simple modifications to SQUASHFS_DECOMP_MULTI. The config
options are upper bounds on the number of decompressors and data cache
blocks. I tested this with the mounted-fs-memory-checker for comparison,
limiting squashfs
This bug was fixed in the package linux - 4.4.0-47.68
---
linux (4.4.0-47.68) xenial; urgency=low
[ Kamal Mostafa ]
* Release Tracking Bug
- LP: #1636941
* Add a driver for Amazon Elastic Network Adapters (ENA) (LP: #1635721)
- lib/bitmap.c: conversion routines to/from
Adding some notes and ideas based on looking more at the squashfs
implementation.
One idea I had was to reduce the data cache (or maybe even eliminate it)
by making squashfs decompress directly into the page cache. It turns out
that squashfs already does this if CONFIG_SQUASHFS_FILE_DIRECT=y, whic
Test build with CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=1 is done.
http://people.canonical.com/~sforshee/lp1636847/linux-4.4.0-46.67+lp1636847v201611071220/
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@zyga: I'm honestly very surprised that the config change had that
drastic an impact on the single-CPU system. Can you tell me what 'cat
/sys/devices/system/cpu/possible' says on that system?
Can I assume that the "size-1M" implies a 1MB block size?
Let's start with the simplest options for reduc
** Changed in: linux (Ubuntu Xenial)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu Yakkety)
Status: Confirmed => Fix Committed
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
** Also affects: linux (Ubuntu Zesty)
Importance: Medium
** Also affects: linux (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: linux (Ubuntu Yakkety)
Status: New =>
After using the CONFING_SQUASHFS_DECOMP_SINGLE=y option in an
experimental kernel the memory usage dropped significantly. The traces
below are for -45 and the experimental -46 kernel. The 1 and 4 are the
number of CPUs on the system.
A single CPU system used to consumer 131MB per mounted snap, thi
Ok test kernels at the URL below, please report testing results back
here:
people.canonical.com/~apw/lp1636847-xenial/
Thanks.
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Title:
unex
Evidence suggests this is triggered by the parallel decompressor. Will
spin a kernel with that switched out:
CONFIG_SQUASHFS_DECOMP_SINGLE=y
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Marking as 'confirmed' so the bot doesn't auto-close it.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
unexpected
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