On Tue, 25 Apr 2006 16:45:18 +0800 erich wrote:
> Dear Randy.Dunlap,
>
> If it is true, I will add sg count check in arcmsr.
> Driver report : host->sg_tablesize=ARCMSR_MAX_SG_ENTRIES to linux scsi host
> layer.
> But got an incorrect request of sg list count from .queuecommand.
> Could you tell me which value of ARCMSR_MAX_XFER_SECTORS (4096/512)?
Hi Erich,
I didn't see 70 sg pieces while using the arcmsr driver, it was
while testing another driver. Sorry if that wasn't clear.
Driver setting host->sg_tablesize should be good enough according
to Documentation/scsi/scsi_mid_low_api.txt . Are you seeing problems
with that? and I don't understand your last question about
ARCMSR_MAX_XFER_SECTORS.
> Best Regards
> Erich chen
>
> ----- Original Message -----
> From: "Randy.Dunlap" <[email protected]>
> To: "erich" <[email protected]>
> Cc: <[email protected]>; <[email protected]>; <[email protected]>;
> <[email protected]>; <[email protected]>; <[email protected]>;
> <[email protected]>; <[email protected]>;
> <[email protected]>
> Sent: Thursday, April 20, 2006 11:38 PM
> Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken
>
>
> > On Thu, 20 Apr 2006 16:11:04 +0800 erich wrote:
> >
> >> Dear Dear Jens Axboe,
> >>
> >> Thanks for your notification and advice.
> >> Areca's firmware has max sg entries of 38 limit.
> >> In my debug driver I had add this condition check.
> >> But no one request more than 38 sg.
> >
> > Yesterday I saw a request with 70 sg pieces. It was while
> > running mkfs.ext3 .
> >
> >> Both transfer length all have a lot of requests equal with 38 sg.
> >> But why it ocur only at 4096 sectors?
> >> If the /sys/block/sda/queue/max_sectors_kb equal 256 all operation
> >> running
> >> well.
> >> But if I modify it more than 256, the bug appeared.
> >> I will do more research about why there were a lot of requests equal
> >> with
> >> 38 sg in all file system.
> >> And only it ocur at the volume that format with mkfs.ext2.
> >> Thanks again.
> >>
> >> Best Regards
> >> Erich Chen
> >>
> >> ----- Original Message -----
> >> From: "Jens Axboe" <[email protected]>
> >> To: "erich" <[email protected]>
> >> Cc: <[email protected]>; <[email protected]>; "Al Viro"
> >> <[email protected]>; "Andrew Morton" <[email protected]>; "Randy.Dunlap"
> >> <[email protected]>; "Matti Aarnio" <[email protected]>;
> >> <[email protected]>; "James Bottomley"
> >> <[email protected]>; "Chris Caputo" <[email protected]>
> >> Sent: Thursday, April 20, 2006 2:42 PM
> >> Subject: Re: new Areca driver in 2.6.16-rc6-mm2 appears to be broken
> >>
> >>
> >> > On Thu, Apr 20 2006, erich wrote:
> >> >> Dear Jens Axboe,
> >> >>
> >> >> I do "fsck -fy /dev/sda1" on driver MAX_XFER_SECTORS 512.
> >> >> The file system was not clean.
> >> >> I attach mesg.txt for you refer to.
> >> >>
> >> >> =====================================
> >> >> == boot with driver MAX_XFER_SECTORS 4096
> >> >> =====================================
> >> >> #mkfs.ext2 /dev/sda1
> >> >> #reboot
> >> >> =====================================
> >> >> == boot with driver MAX_XFER_SECTORS 512
> >> >> =====================================
> >> >> #fsck -fy /dev/sda1
> >> >> /dev/sda1:clean,.............
> >> >> #reboot
> >> >> =====================================
> >> >> == boot with driver MAX_XFER_SECTORS 4096
> >> >> =====================================
> >> >> #mount /dev/sda1 /mnt/sda1
> >> >> #cp /root/aa /mnt/sda1
> >> >> #reboot
> >> >> =====================================
> >> >> == boot with driver MAX_XFER_SECTORS 512
> >> >> =====================================
> >> >> #fsck -fy /dev/sda1
> >> >> /dev/sda1: no clean,........and dump message such as the attach file
> >> >> mesg.txt.
> >> >
> >> > So the conclusion is that your driver and/or hardware corrupts data
> >> > when
> >> > you set MAX_XFER_SECTORS too high. I can't help you anymore with this,
> >> > you should be in the best position to debug the driver and/or hardware
> >> > :-)
> >> >
> >> > It could be that the higher setting just exposes another transfer
> >> > setting bug, like maximum number of segments or segment size, etc.
> >> >
> >> > --
> >> > Jens Axboe
> >> >
> >>
> >>
> >
> >
> > ---
> > ~Randy
>
>
---
~Randy
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
