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SubjectRe: What's in linux-2.6-block.git
Date
Jens Axboe wrote:
> On Wed, Sep 13 2006, Al Boldi wrote:
> > Jens Axboe wrote:
> > > This lists the main features of the 'block' branch, which is bound for
> > > Linus when 2.6.19 opens:
> > >
> > > - Splitting of request->flags into two parts:
> > > - cmd type
> > > - modified flags
> > > Right now it's a bit of a mess, splitting this up invites a cleaner
> > > usage and also enables us to implement generic "messages" passed on
> > > the regular queue for the device.
> > >
> > > - Abstract out the request back merging and put it into the core io
> > > scheduler layer. Cleans up all the io schedulers, and noop gets
> > > merging for "free".
> > >
> > > - Abstract out the rbtree sorting. Gets rid of duplicated code in
> > > as/cfq/deadline.
> > >
> > > - General shrinkage of the request structure.
> > >
> > > - Killing dynamic rq private structures in deadline/as/cfq. This
> > > should speed up the io path somewhat, as we avoid allocating several
> > > structures (struct request + scheduler private request) for each io
> > > request.
> > >
> > > - meta data io logging for blktrace.
> > >
> > > - CFQ improvements.
> > >
> > > - Make the block layer configurable through Kconfig (David Howells).
> > >
> > > - Lots of cleanups.
> >
> > Does it also address the strange "max_sectors_kb<>192 causes a
> > 50%-slowdown" problem?
>
> (remember to cc me/others when replying, I can easily miss lkml
> messages for several days otherwise).
>
> It does not, the investigation of that is still pending I'm afraid. The
> data is really puzzling, I'm inclined to think it's drive related. Are
> you reproducing it just one box/drive, or on several?

Several boxes, same drive.

/dev/hda:

ATA device, with non-removable media
Model Number: WDC WD1200JB-00DUA0
Serial Number: WD-WMACM1007651
Firmware Revision: 65.13G65
Standards:
Supported: 6 5 4 3
Likely used: 6
Configuration:
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
--
CHS current addressable sectors: 4128705
LBA user addressable sectors: 234441648
LBA48 user addressable sectors: 234441648
device size with M = 1024*1024: 114473 MBytes
device size with M = 1000*1000: 120034 MBytes (120 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 98 Queue depth: 1
Standby timer values: spec'd by Standard, with device specific minimum
R/W multiple sector transfer: Max = 16 Current = 16
Recommended acoustic management value: 128, current value: 254
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
Automatic Acoustic Management feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
* SMART self-test
* SMART error logging
Security:
supported
not enabled
not locked
frozen
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
Checksum: correct


Thanks!

--
Al

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