lkml.org 
[lkml]   [2006]   [May]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: How can I boost block I/O performance
Avi Kivity wrote:

> Dave Pitts wrote:
>
>> Hello all:
>>
>> I've been trying some hacks to boost disk I/O performance mostly by
>> changing values
>> in the /proc/sys/vm filesystem. A vmstat display shows bursty block
>> out counts with
>> fairly consistent interrupt counts:
>>
>> procs -----------memory---------- ---swap-- -----io---- --system--
>> ----cpu----
>> r b swpd free buff cache si so bi bo in cs us
>> sy id wa
>> 4 0 720 80252 1820 7077456 0 0 9 852 5 11 1
>> 14 84 0
>
> [...]
>
>> 5 0 720 90364 1860 7067080 0 0 40 66956 17995 95384
>> 0 17 82 0
>>
>> This test is running several NFS clients to a RAID disk storage
>> array. I also see the
>> same behavior when running SFTP transfers. What I'd like is a more
>> even block
>> out behavior (even at the expense of other apps as this is a file
>> server not an app
>> server). The values that I've been hacking are the
>> dirty_writeback_centisecs,
>> dirty_background_ratio, etc. Am I barking up the wrong tree?
>
> No iowait time, plenty of idle time: looks like you are network
> bound. What time of network are you running?
>
Well, it's an 8 cpu system. Does the idle time reflect the idle time of
all cpu's?
The network is a Gigabit Ethernet.


--
Dave Pitts PULLMAN: Travel and sleep in safety and comfort.
dpitts@cozx.com My other RV IS a Pullman (Colorado Pine).
http://www.cozx.com/~dpitts

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-05-06 23:16    [W:0.155 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site