Redhat 系统提速[原作：hotmanhh兄弟]

fengzhongdeying

我的机器上保留了以上试个外还有
autofs
random
rawdevices
xinetd
估计最后一个应该是必须的，要不然你怎么起系统服务啊

dragonman

谢谢南北兄!

lxl54321

[root@mis006 X11]# hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads:   128 MB in  0.38 seconds =332.69 MB/sec
Timing buffered disk reads:  64 MB in 10.93 seconds =  5.86 MB/sec
[root@mis006 X11]# hdparm -d1 -X68 -c3 -m16 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 68 (UltraDMA mode4)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@mis006 X11]# hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads:   128 MB in  0.38 seconds =337.84 MB/sec
Timing buffered disk reads:  64 MB in  1.38 seconds = 46.41 MB/sec
[root@mis006 X11]#
[root@mis006 X11]# hdparm -d1 -X70 -c3 -m16 /dev/hdc

/dev/hdc:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 70 (UltraDMA mode6)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@mis006 X11]# hdparm -Tt /dev/hdc

/dev/hdc:
Timing buffer-cache reads:   128 MB in  0.41 seconds =313.59 MB/sec
Timing buffered disk reads:  64 MB in  2.14 seconds = 29.84 MB/sec
[root@mis006 X11]#
好像太快了，是不是？

离弦之箭

一般关闭DMA测试：
[root@firefly /root]# hdparm -d0 /dev/hda

/dev/hda:

setting using_dma to 0 (off)
using_dma = 0 (off)

[root@firefly /root]# hdparm -Tt /dev/hda

/dev/hda:

Timing buffer-cache reads: 128 MB in 2.75 seconds = 46.55 MB/sec
Timing buffered disk reads: 64 MB in 15.58 seconds = 4.11 MB/sec
-----------------------------------------------------
我关闭DMA测试
Timing buffered disk reads: 64 MB.....  只有2.1MB/sec
这是怎么回事？速度这慢？

sdund-chs

帮忙看看我这个是不是正常：
[root@csc-438 sbin]# hdparm -X68 -d1 -c3 -m16 /dev/hda
(我的硬盘是希捷的　型号：ST315323A　支持ATA66）电脑反应：
/dev/hda:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1(on)
blk:queue CD3c0004,I/O limit 4095Mb(mask 0xffffffff)
setting xfermode to 68(ultra DMA mode 4)
ide 0:Speed warnings UDMA 3/4/5 is not fanctional.
mutlcount=16c07(这一行可能拼写不对，大致是这样）
IO＿support  =3(v-bit w/sync)
using_dma    =1(on)
[root@csc-438 sbin]#PCI:Setting latency timer of device 00:1f.5 to 64   
i810_auto:AC'97 codec 0 Unable to mapsurround DC's(or DAC's not present),total channels=2   (音箱在WinMe下很好用，而且没有动）
ide-floppy drver 0.99.newide
hdc:ATAPI 52X CD-ROM drive,128kB cache.
然后就没返回[root@csc-438 sbin]#

sdund-chs

四、减少虚拟终端机的数量。

修改 /etc/inittab 中，将 mingetty 3 ～6 全部加上 # 字号，然後下指令 #init q


六、调整应用程序优先权。

……这是手动操作，在 KDE 中，可以用选单编辑器来设定，方法是在你要调整优先权的程序的 [ 命令 ] 那一栏的前面，加上 /bin/nice --n 就可以了。

比方说我常用 Mozilla 来浏览网页，我改成 /bin/nice --10 /usr/local/mozilla/mozilla 这样我的 Mozilla 执行时，就比其他程序有更高的优先权，在实际测试的时候，Mozilla 激活速度以及回应都快了不少，其他一些常用的程序，也可以比照办理。

⒈关于减少虚拟终端机的数量，
“＃”号后要有空格吧？
在哪里下指令？在/etc/inittab中加上这段指令？
⒉关于调整应用程序优先权
RH8.0的KDE下怎么调整？

ida

[root@q-v-p root]# hdparm -d1 -X69 -c3 -m16 /dev/hdc

/dev/hdc:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 69 (UltraDMA mode5)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@q-v-p root]# hdparm -Tt /dev/hdc

/dev/hdc:
Timing buffer-cache reads:   128 MB in  0.49 seconds =261.22 MB/sec
Timing buffered disk reads:  64 MB in  1.60 seconds = 40.00 MB/sec
[root@q-v-p root]# hdparm -d1 -X68 -c3 -m16 /dev/hdc

/dev/hdc:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 68 (UltraDMA mode4)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@q-v-p root]# hdparm -Tt /dev/hdc

/dev/hdc:
Timing buffer-cache reads:   128 MB in  0.46 seconds =278.26 MB/sec
Timing buffered disk reads:  64 MB in  1.64 seconds = 39.02 MB/sec
[root@q-v-p root]# hdparm -d1 -X66 -c3 -m16 /dev/hdc

/dev/hdc:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 66 (UltraDMA mode2)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@q-v-p root]# hdparm -Tt /dev/hdc

/dev/hdc:
Timing buffer-cache reads:   128 MB in  0.48 seconds =266.67 MB/sec
Timing buffered disk reads:  64 MB in  3.79 seconds = 16.89 MB/sec

ida

最好还是 UDMA MODE4,我的硬盘是希捷酷鱼IV 80G

ygajdi

[root@appleangel angel]# hdparm -d1 -X68 -c3 -m16 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 3
setting multcount to 16
setting using_dma to 1 (on)
setting xfermode to 68 (UltraDMA mode4)
multcount    = 16 (on)
IO_support   =  3 (32-bit w/sync)
using_dma    =  1 (on)
[root@appleangel angel]# hdparm -Tt /dev/hda

/dev/hda:
Timing buffer-cache reads:   128 MB in  0.26 seconds =492.31 MB/sec
Timing buffered disk reads:  64 MB in  1.58 seconds = 40.51 MB/se

gohands

#  hdparm -d1  -c3 -m16 /dev/sda

/dev/sda:
operation not supported on SCSI disks