From: Chris Morgan <cmorgan@alum.wpi.edu>
To: Doug McNaught <doug@mcnaught.org>
Subject: Re: 2.5.XX very sluggish
Date: Tue, 15 Jul 2003 22:32:59 -0400
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References: <200307131228.00155.cmorgan@alum.wpi.edu> <m38yr2e5pv.fsf@varsoon.wireboard.com> <200307132321.26835.cmorgan@alum.wpi.edu>
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I see the same behavior with 2.6.0 test1.  I can't imagine I'm the only person 
seeing this issue, anything else I can do to help with debugging?

Chris


On Sunday 13 July 2003 11:21 pm, Chris Morgan wrote:
> Under 2.4.21:
>
> For my boot drive, ide:
>
> /dev/hdc2:
>  multcount    = 16 (on)
>  IO_support   =  1 (32-bit)
>  unmaskirq    =  1 (on)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    =  8 (on)
>  geometry     = 2100/255/63, sectors = 32740470, start = 996030
>
> For the scsi drives(2 drives in a raid 1 setup):
> /dev/sda:
>  readonly     =  0 (off)
>  geometry     = 17885/255/63, sectors = 287332384, start = 0
>
> And some performance numbers, maybe these are helpful:
>
> /dev/md1:
>  Timing buffer-cache reads:   128 MB in  0.60 seconds =213.33 MB/sec
>  Timing buffered disk reads:  64 MB in  2.22 seconds = 28.83 MB/sec
>
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in  0.56 seconds =228.57 MB/sec
>  Timing buffered disk reads:  64 MB in  4.33 seconds = 14.78 MB/sec
>
>
>
> Under 2.5.75:
>
> /dev/hdc:
>  multcount    = 16 (on)
>  IO_support   =  1 (32-bit)
>  unmaskirq    =  1 (on)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 33483/16/63, sectors = 33750864, start = 0
>
> These are with X running:
>
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in 30.58 seconds =  4.19 MB/sec
>  Timing buffered disk reads:  64 MB in 20.98 seconds =  3.05 MB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test.
>
> /dev/md1:
>  Timing buffer-cache reads:   128 MB in 108.76 seconds =  1.18 MB/sec
>  Timing buffered disk reads:  64 MB in 44.86 seconds =  1.43 MB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test.
>
> With X shutdown:
> /dev/hdc:
>  Timing buffer-cache reads:   128 MB in 11.26 seconds = 11.36 MB/sec
>  Timing buffered disk reads:  64 MB in  6.88 seconds =  9.30 MB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test.
>
> /dev/md1:
>  Timing buffer-cache reads:   128 MB in 11.88 seconds = 10.77 MB/sec
>  Timing buffered disk reads:  64 MB in  7.74 seconds =  8.27 MB/sec
> Hmm.. suspicious results: probably not enough free memory for a proper
> test.
>
> I'm running xf4.2.1 and the 'nv' driver.
>
> Any ideas as to what else I can look at?
>
> Thanks,
> Chris
>
> On Sunday 13 July 2003 12:45 pm, Doug McNaught wrote:
> > Chris Morgan <cmorgan@alum.wpi.edu> writes:
> > > 1.4Ghz Athlon via 82cxx chipset, software raid 1 scsi drives, currently
> > > running 2.4.21
> > >
> > > With 2.5.73/74/75(the only ones I've tried thus far) the kernel boots
> > > fine until it tries to mount the reiserfs partition on the raid1 set.
> > > Replaying the journal takes many times longer than with 2.4.  Once it
> > > gets past that point the whole machine appears to be quite sluggish. 
> > > Is this a known issue with reiserfs + software raid 1?  What
> > > information would be useful to aid in debugging?
> >
> > What does 'hdparm' say about DMA settings on your drive under 2.5?
> >
> > -Doug

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