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Document the effects of LD_AUDIT with unpatched glibc versions

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This goes some way to satisfy the concerns of issue #15 so that everyone
knows where they stand, how to mitigate this **now**, and what we intend
to do about this in future.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>
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Ikey Doherty
2017-10-12 16:16:10 +01:00
parent be3023263f
commit 665caee634
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README.md
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@@ -219,6 +219,30 @@ $ LSI_DEBUG=1 steam
$ LSI_DEBUG=1 lsi-steam
```
### liblsi-intercept regressing performance
There exists a bug in `glibc` which incorrectly configures profiling for all PLT calls when using `LD_AUDIT` (rtld-audit)
even if the audit library doesn't implement `la_pltenter` or `la_pltexit`. This leads to a performance hit on every
runtime call via PLT.
The issue was first reported to this project by @amonakov [here](https://github.com/solus-project/linux-steam-integration/issues/15).
The upstream glibc issue is reported on the upstream glibc [bugzilla](https://sourceware.org/bugzilla/show_bug.cgi?id=15533).
A patch to resolve the issue was submitted by @amonakov [here](https://sourceware.org/ml/libc-alpha/2013-05/msg00888.html).
If you are noticing performance regressions, you can:
- As a user: Disable `liblsi-intercept` via `lsi-settings`. This will hurt compatibility.
- As a packager: Disable `liblsi-intercept` via build flags. This will hurt compatibility.
- As a distribution integrator: Add weight to upstream issue and import patch into your distribution.
This will retain LSI compatibility magic and mitigate performance issues.
As an example, Solus has already [integrated the patch](https://dev.solus-project.com/R927:afa5b639e8a9b62618457a304d1e6fb42a9f2066).
The long term solution is to remove this burden from non-Solus Linux distributions, and for the Solus & LSI projects to
provide a specialised runtime & strict LSI build via third party mechanisms so that all this work only needs doing once.
This will help ensure the same gaming experience regardless of Linux distribution, remove all compatibility issues, and
any pressures on distributions. Additionally this will allow even distributions not supporting multilib to provide a
curated and well integrated gaming runtime.
## License