Messages in this thread | | | From | Al Boldi <> | Subject | Re: What's in linux-2.6-block.git | Date | Wed, 13 Sep 2006 14:35:31 +0300 |
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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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