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?
I have smp disabled, preemption enabled, tried with generic x86
disabled/enabled.
Thanks,
Chris
Please cc me on replies, I'm not on the list yet.
Chris Morgan <[email protected]> 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
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 <[email protected]> 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
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 <[email protected]> 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