Bug 1400144 - glibc: Performance penalty due to block size-based buffering in stdio
Summary: glibc: Performance penalty due to block size-based buffering in stdio
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: 26
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: glibc team
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: 988869
TreeView+ depends on / blocked
 
Reported: 2016-11-30 14:29 UTC by Florian Weimer
Modified: 2017-10-09 11:48 UTC (History)
9 users (show)

Fixed In Version:
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Doc Text:
Clone Of: 988869
Environment:
Last Closed: 2017-10-09 11:48:23 UTC
Type: Bug
Embargoed:

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System ID Private Priority Status Summary Last Updated
Sourceware 4099 0 None None None 2016-11-30 14:29:12 UTC

Description Florian Weimer 2016-11-30 14:29:12 UTC 
For some network file systems, the kernel returns block size values of several megabytes.  The stdio streams auto-tuning in glibc currently allocates matching buffer sizes.  This causes significant performance problems if the applications uses stdio streams for non-sequential file access.

We should backport the upstream patch to fix this.
Comment 1 Fedora End Of Life 2017-02-28 10:41:50 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
Comment 2 Florian Weimer 2017-10-09 11:48:23 UTC 
This is included in glibc 2.25 (Fedora 26) and glibc 2.26 (Fedora 27).
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