Re: xmm2 - monitor Linux MM active/inactive lists graphically

Josh McKinney (forming@home.com)
Tue, 30 Oct 2001 14:07:38 -0500

On approximately Tue, Oct 30, 2001 at 10:26:32AM +0100, Zlatko Calusic wrote:
>
> Followup on the problem. Yesterday I was upgrading my Debian Linux. To
> do that I have to remount /usr read-write. After the update finished,
> I tested once again disk writing speed. And there it was, full
> 22MB/sec (on the same partition). And once I get to that point, disk
> will remain performant. Then I thought (poor man's logic) that poor
> performance might have something to do with my /usr mounted read-only
> (BTW, it's on the same disk I'm having problems with).
>
> Quick test: reboot (/usr is ro), check speed -> only 8MB/sec, remount
> /usr rw, but unfortunately didn't help, writing speed remains low.
>
> So it was just an idea. I still don't know what can be done to return
> speed to normal. I don't know if I have mentioned, but reading from
> the same disk is always going at the full speed.
>
> So, something might be wrong with my setup, but I'm still unable to
> find what.
>
> I'm compiling with 2.95.4 20011006 (Debian prerelease) from the Debian
> unstable distribution. Kernel is completely monolithic (no modules).
>

I am also seeing some not_so_great performance from my ide drive. It
is a IBM 30GB 7200rpm drive on a promise ata/100 controller. I am
also using Debian unstable, but I hope that isn't really the problem.
The vmstat output seems very erratic. It has large bursts then really
slow spots.

I am running 2.4.13-ac4, with rik's swapoff patch.

This is the command I used.

time nice -n -20 dd if=/dev/zero of=/mp3/foobara bs=1024k count=1024
1024+0 records in
1024+0 records out
0.02s user 23.95s system 20% cpu 1:57.24 total

And here is the vmstat output...

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 0 112636 18728 78352 0 0 58 2139 145 90 5 10 85
0 0 3 0 112636 18728 78352 0 0 0 48 115 73 0 5 95
1 0 0 0 91052 18728 99856 0 0 0 65 135 81 0 40 60
1 0 1 0 41900 18728 149008 0 0 0 31474 198 32 1 99 0
0 1 1 0 6104 18756 184748 0 0 0 10608 193 35 1 78 21
0 1 1 0 3064 18768 187756 0 0 0 10296 189 52 0 35 65
0 1 5 0 3060 18796 187704 0 0 0 10808 205 62 2 21 77
0 1 2 0 3064 18948 187412 0 0 0 130132 2654 812 0 23 76
0 1 2 0 3060 18956 187404 0 0 0 10692 188 54 0 26 74
1 0 3 0 3060 18964 187392 0 0 0 9818 199 53 1 26 73
0 1 3 0 3060 18976 187368 0 0 0 7308 186 52 1 23 76
0 3 2 0 3068 19016 187296 0 0 0 73788 1459 417 0 23 77
0 3 3 0 3076 19444 186436 0 0 0 6392 188 31 1 9 90
0 3 3 0 3076 19444 186436 0 0 0 10832 188 15 0 2 98
0 3 3 0 3076 19444 186436 0 0 0 10536 188 17 0 4 96
0 3 2 0 3076 19444 186436 0 0 0 6556 191 31 0 1 99
2 0 0 0 3064 19444 186448 0 0 0 17424 724 120 0 9 91
1 0 1 0 3064 19444 186896 0 0 0 22724 201 33 2 98 0
0 1 1 0 3064 19444 186540 0 0 0 9872 187 47 1 46 53
0 1 1 0 3060 19444 186464 0 0 0 2840 193 57 0 15 85
0 1 1 0 3060 19444 186464 0 0 0 11088 201 54 0 19 81
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 2 0 3060 19500 186360 0 0 0 118288 2232 604 0 25 75
0 3 2 0 3060 19500 186360 0 0 0 7748 185 57 1 1 98
0 3 2 0 3060 19500 186360 0 0 0 11776 184 54 0 2 98
0 3 2 0 3060 19500 186360 0 0 0 7924 181 52 0 1 99
0 3 2 0 3060 19500 186360 0 0 0 4776 182 64 0 1 99
0 3 1 0 3060 19500 186360 0 0 0 952 183 50 0 2 98
0 3 1 0 3060 19500 186360 0 0 0 0 180 48 0 1 99
1 0 2 0 3064 19500 186356 0 0 0 296 242 80 0 12 88
0 1 0 0 3060 19500 186360 0 0 0 19668 730 282 1 7 93
0 1 0 0 3060 19500 186360 0 0 0 6764 200 133 1 2 97
1 0 0 0 3064 19500 186356 0 0 0 16680 171 123 1 64 35
1 0 1 0 3060 19500 186360 0 0 0 26903 193 33 1 99 0
0 1 1 0 3064 19500 186356 0 0 0 7756 184 40 1 54 45
0 1 5 0 3060 19500 186360 0 0 0 10915 182 66 0 23 77
0 3 3 0 3060 19668 186024 0 0 0 105102 2059 629 0 18 82
0 3 3 0 3060 19668 186024 0 0 0 7772 181 59 0 1 99
0 4 1 0 3060 19668 185948 0 0 1 7440 187 68 0 2 98
0 4 1 0 3060 19668 185948 0 0 0 260 187 57 0 2 98
0 4 1 0 3064 19668 185948 0 0 0 0 181 69 0 1 99
0 5 2 0 3276 19668 185944 0 0 5 522 180 69 3 5 92
1 1 2 0 3064 19668 185740 0 0 25 26593 190 96 0 78 22
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 4 0 3064 19788 184768 0 0 13 99062 2190 647 0 20 79
0 4 1 0 3064 19788 184768 0 0 0 2440 218 57 0 3 97
0 4 1 0 3064 19788 184768 0 0 1 0 217 51 0 0 100
1 1 5 0 3060 19788 185148 0 0 24 14692 214 108 2 46 52
0 4 2 0 3064 19824 185068 0 0 8 19965 940 240 0 24 75
0 4 2 0 3064 19824 185068 0 0 0 3224 293 64 0 0 100
0 4 2 0 3064 19824 185068 0 0 0 4624 310 64 0 3 97
0 4 2 0 3140 19824 184864 0 0 4 3316 245 86 1 4 95
0 4 2 0 3140 19824 184864 0 0 0 2608 252 58 0 1 99
0 4 2 0 3140 19824 184864 0 0 0 6208 262 58 0 0 100
1 3 2 0 3144 19824 184864 0 0 0 11864 228 58 1 1 98
0 4 1 0 3140 19824 184864 0 0 4 1200 241 86 1 5 94
0 4 3 0 3140 19824 184864 0 0 0 27 182 51 0 1 99
1 1 3 0 3064 19824 184936 0 0 16 24423 183 104 1 61 38
0 3 6 0 3064 19940 183904 0 0 69 44339 995 314 1 25 74
0 3 5 0 3064 19940 183904 0 0 0 100 180 51 0 0 100
0 3 5 0 3064 19940 183904 0 0 0 0 187 50 0 1 99

-- 
Linux, the choice                | "Shelter," what a nice name for for a place
of a GNU generation       -o)    | where you polish your cat. 
Kernel 2.4.13-ac4          /\    | 
on a i586                 _\_v   | 
                                 | 
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