IO scheduler being set to cfq is causing long hangs and bad performance during large file writes
Reported by
jc2...@cornell.edu,
Nov 26 2016
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Issue descriptionUserAgent: Mozilla/5.0 (X11; CrOS x86_64 8872.54.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.54 Safari/537.36 Platform: 8872.54.0 (Official Build) beta-channel lulu Steps to reproduce the problem: Use a microSD card. Verify that /sys/block/sd*/queue/scheduler for the SD card is set to cfq Have a large (~1 GB) file on an SSD Use the command line to copy the file from the SSD to the SD card. What is the expected behavior? Minimal hang, no freezing What went wrong? Chrome hangs, other applications hang until the file is completely written to the SD card. Did this work before? Yes Likely before this change: https://bugs.chromium.org/p/chromium/issues/detail?id=390336 Chrome version: 55.0.2883.54 Channel: beta OS Version: 8872.54.0 Flash Version: Shockwave Flash 23.0 r0 The performance is good if I manually set the scheduler to "noop" for the SD card.
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Jan 28 2017
The issue seems to have fixed itself after an update in the last few weeks.
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Feb 13 2018
Issue has not been modified or commented on in the last 365 days, please re-open or file a new bug if this is still an issue. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot |
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Comment 1 by rohi...@chromium.org
, Jan 27 2017