linux-kernel - Re: [PATCHSET v4 0/8] Make background writeback not suck

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Date:	Tue, 26 Apr 2016 09:04:53 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jens Axboe <axboe@...com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-block@...r.kernel.org, jack@...e.cz, dchinner@...hat.com
Subject: Re: [PATCHSET v4 0/8] Make background writeback not suck

Hi Jens,

I am testing current linux-block.git#wb-buf-throttle on top of Linux
v4.6-rc5 here on my Ubuntu/precise AMD64.
( Was installed as a WUBI "test" system - "testing" since April 2012 :-) .)

Here are some numbers:

# df -T | egrep  'sda|loop'
/dev/sda2      fuseblk  465546236 210981868 254564368   46% /host
/dev/loop0     ext4      17753424  15586612   1241936   93% /

# egrep 'sda|loop|ext4' /etc/fstab
/host/ubuntu/disks/root.disk    /               ext4
loop,errors=remount-ro  0       1
/host/ubuntu/disks/swap.disk    none            swap    loop,sw
         0       0

( Not sure why I cannot do a find on /sys/block/ .)

# find /sys/devices/ -name '*wb_stat*' | egrep 'loop0|sda'
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/wb_stats
/sys/devices/virtual/block/loop0/queue/wb_stats

# find /sys/devices/ -name '*wb_lat*' | egrep 'loop0|sda'
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/wb_lat_usec
/sys/devices/virtual/block/loop0/queue/wb_lat_usec

# cat /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/wb_stats
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/queue/wb_lat_usec
background=8, normal=16, max=31, inflight=0, wait=0, bdp_wait=0
75000

# cat /sys/devices/virtual/block/loop0/queue/wb_stats
/sys/devices/virtual/block/loop0/queue/wb_lat_usec
background=16, normal=32, max=64, inflight=0, wait=0, bdp_wait=0
75000

Questions...

Planning a v5?
Will this go to Linux v4.7 or later?
How should someone test?

Documentation...

Can you add some more docs about getting infos (see above cat#s etc.)
below Documentation/ directory?
( Talking about the stuff you have embedded in the commit-messages. )

Unfortunately, I have no more data-volume (using Mobile Broadband
Network @ 56kBps), so I cannot send you my dmesg, linux-config and
patchset.

Regards,
- Sedat -

View attachment "dmesg_4.6.0-rc5-9-iniza-small.txt" of type "text/plain" (62131 bytes)

Download attachment "config-4.6.0-rc5-9-iniza-small" of type "application/octet-stream" (135133 bytes)