Re: Weird behavior writing to SSD on 2013 MacBook

From: Dimitry Andric <dim_at_FreeBSD.org>
Date: Thu, 5 Feb 2015 08:56:59 +0100
If you let bsdtar continue, and press control-T a few times, does the
user time (u) increase at all?  Does it ever go any further, if you let
it run for a very long time?

I believe a problem may have been introduced by r277922, leading to
filesystem hangs in some scenarios.  It looks like this commit is also
in dumbbell's github fork:

https://github.com/dumbbell/freebsd/commit/83723416a6bb8695d60c6573722a81086899f521

-Dimitry

> On 05 Feb 2015, at 08:32, Lundberg, Johannes <johannes_at_brilliantservice.co.jp> wrote:
> 
> The release is the latest snapshot memstick image and kernel is from
> https://github.com/dumbbell/freebsd/tree/kms-drm-update-38.
> 
> I think this problem existed before I changed kernel.
> 
> I haven't changed any settings on the filesystem so I assume TRIM is off.
> 
> When stopped "bsdtar" is in state "flswai". What does this mean?
> 
> / is 13 GB and 80% full.
> 
> 
> --
> Johannes Lundberg
> BRILLIANTSERVICE CO., LTD.
> 
> On Thu, Feb 5, 2015 at 4:21 PM, Allan Jude <allanjude_at_freebsd.org> wrote:
> 
>> On 2015-02-04 20:40, Lundberg, Johannes wrote:
>>> By the way,
>>> 
>>> For the second test I first ran portsnap extract without removing the old
>>> /usr/ports folder and it ran through quickly without any halts..
>>> 
>>> --
>>> Johannes Lundberg
>>> BRILLIANTSERVICE CO., LTD.
>>> 
>>> On Thu, Feb 5, 2015 at 10:38 AM, Lundberg, Johannes <
>>> johannes_at_brilliantservice.co.jp> wrote:
>>> 
>>>> I deleted /usr/ports and did a new portsnap extract
>>>> 
>>>> portsnap stopped at /usr/ports/editors/teco
>>>> 
>>>> that folder is empty and the previous folder (editors/tea) is populated
>>>> with files.
>>>> 
>>>> portsnap stopped for about 2-3 minutes and during the whole time gstat
>>>> showed values like this: (disc io load was constantly fluctuating around
>>>> 200 MB/s, not static)
>>>> 
>>>> dT: 1.002s  w: 1.000s
>>>> L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
>>>> 1240  43523      0      0    0.0  43523 220158   24.1   99.5| ada0
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p1
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p2
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p3
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p4
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p5
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p6
>>>> 1240  43523      0      0    0.0  43523 220158   24.1   99.5| ada0p7
>>>>    0      0      0      0    0.0      0      0    0.0    0.0| ada0p8
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gpt/EFI%20System%20Partition
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/ca33c17c-0ef4-4d9b-b2bb-cb37a907504b
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>> msdosfs/EFI
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>> gpt/Untitled
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/319461e8-0310-47d5-b4d1-6ba5a92cf9a9
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gpt/Recovery%20HD
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/cb9530b7-8872-46d0-b36c-fca667b4e541
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/6ac11466-21c5-4420-85bc-eb1c3c7fa616
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/0047cc59-6b75-4508-98d0-842beafd3164
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> gptid/ddebb168-ac18-11e4-8f9e-283737012e32
>>>>    0      0      0      0    0.0      0      0    0.0    0.0|
>>>> msdosfs/NO_NAME
>>>> 
>>>> 
>>>> That is, 100% busy and 200 MB/s...
>>>> 
>>>> top shows
>>>> 
>>>> last pid: 13709;  load averages:  1.18,  0.98,
>>>> 0.58
>>>> up 0+00:28:36  10:35:38
>>>> 27 processes:  1 running, 26 sleeping
>>>> CPU:  0.0% user,  0.0% nice, 12.3% system, 11.1% interrupt, 76.6% idle
>>>> Mem: 25M Active, 651M Inact, 587M Wired, 30M Cache, 411M Buf, 2566M Free
>>>> Swap: 706M Total, 706M Free
>>>> 
>>>> 
>>>> I have used FreeBSD with SSD plenty and never seen this behavior before.
>>>> 
>>>> --
>>>> Johannes Lundberg
>>>> BRILLIANTSERVICE CO., LTD.
>>>> 
>>>> On Thu, Feb 5, 2015 at 10:14 AM, Allan Jude <allanjude_at_freebsd.org>
>> wrote:
>>>> 
>>>>> On 2015-02-04 19:29, Lundberg, Johannes wrote:
>>>>>> Hi
>>>>>> 
>>>>>> I'm thought I was gonna do some test runs with HEAD on a 2013 Macbook
>>>>> Air
>>>>>> and noticed some weird behavior regarding disk I/O.
>>>>>> 
>>>>>> This happens both when doing portsnap extract and clone from git
>>>>> repository.
>>>>>> 
>>>>>> For example portsnap extract, the extraction process (the output of
>> it)
>>>>>> suddenly stops, for seconds or maybe even minutes, quite many times
>>>>> during
>>>>>> the whole extraction process.
>>>>>> iostat reports ~200 MB/s on ada0 the whole time during freeze.
>>>>>> 
>>>>>> 
>>>>>> pciconf:
>>>>>> 
>>>>>> ahci0_at_pci0:4:0:0:    class=0x010601 card=0x91831b4b chip=0x91831b4b
>>>>>> rev=0x14 hdr=0x00
>>>>>>    vendor     = 'Marvell Technology Group Ltd.'
>>>>>>    class      = mass storage
>>>>>>    subclass   = SATA
>>>>>> 
>>>>>> 
>>>>>> dmesg (relevant lines?):
>>>>>> 
>>>>>> ahci0: <Marvell 88SS9183 AHCI SATA controller> port
>>>>>> 0x1028-0x102f,0x1034-0x1037,0x1020-0x1027,0x1030-0x1033,0x1000-0x101f
>>>>> mem
>>>>>> 0xb0700000-0xb07001ff at device 0.0 on pci4
>>>>>> ahci0: AHCI v1.00 with 1 6Gbps ports, Port Multiplier not supported
>>>>>> ahcich0: <AHCI channel> at channel 0 on ahci0
>>>>>> 
>>>>>> ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
>>>>>> ada0: <APPLE SSD SD0128F A222821> ATA-8 SATA 3.x device
>>>>>> ada0: Serial Number 1325A5401681 \^T\^T\^T\^T\^T\^T\^T
>>>>>> ada0: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 512bytes)
>>>>>> ada0: Command Queueing enabled
>>>>>> ada0: 115712MB (236978176 512 byte sectors: 16H 63S/T 16383C)
>>>>>> ada0: Previously was known as ad4
>>>>>> 
>>>>>> GEOM: ada0: enabling Boot Camp
>>>>>> GEOM: diskid/DISK-1325A5401681%20%14%14%14%14%14%14%14: enabling Boot
>>>>> Camp
>>>>>> 
>>>>>> 
>>>>>> gpart:
>>>>>> 
>>>>>> =>       34  236978109  ada0  GPT  (113G)
>>>>>>         34          6        - free -  (3.0K)
>>>>>>         40     409600     1  efi  (200M)
>>>>>>     409640  174519128     2  apple-hfs  (83G)
>>>>>>  174928768    1269536     3  apple-boot  (620M)
>>>>>>  176198304       1376        - free -  (688K)
>>>>>>  176199680   29782016     4  linux-data  (14G)
>>>>>>  205981696    2097152     5  linux-swap  (1.0G)
>>>>>>  208078848       1600     6  efi  (800K)
>>>>>>  208080448   27261368     7  freebsd-ufs  (13G)
>>>>>>  235341816    1445888     8  freebsd-swap  (706M)
>>>>>>  236787704     190439        - free -  (93M)
>>>>>> 
>>>>>> 
>>>>>> One other weird thing is that FreeBSD does not show up in the refind
>>>>> boot
>>>>>> menu by default, only OSX and Linux. I have to press ESC once to
>> reload
>>>>> for
>>>>>> FreeBSD boot option to show up.. Any clues? Is my partition
>>>>> configuration
>>>>>> wrong in some way?
>>>>>> 
>>>>>> Thanks!
>>>>>> --
>>>>>> Johannes Lundberg
>>>>>> BRILLIANTSERVICE CO., LTD.
>>>>>> 
>>>>> 
>>>>> For the disk io bit, try running 'gstat' instead of iostat, and see
>> what
>>>>> it says.
>>>>> 
>>>>> --
>>>>> Allan Jude
>>>>> 
>>>>> 
>>>> 
>>> 
>> 
>> Is the disk nearly full? very random guess, but maybe it is the SSD
>> running its garbage collection when it runs out of space. Do you have
>> TRIM enabled?
>> 
>> --
>> Allan Jude
>> 
>> 
> 
> --
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Received on Thu Feb 05 2015 - 06:57:10 UTC

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