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Date: Tue, 8 Dec 2009 23:30:07 GMT
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From: Kevin <kevin@your.org>
Cc: 
Subject: Re: kern/141305: FreeBSD ZFS+sendfile severe performance issues (no
	cache)
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The following reply was made to PR kern/141305; it has been noted by GNATS.

From: Kevin <kevin@your.org>
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/141305: FreeBSD ZFS+sendfile severe performance issues (no cache)
Date: Tue, 8 Dec 2009 17:07:00 -0600

 I can confirm similar results.
 
 If the filesystem is ZFS, calling sendfile(2) over and over again on  
 the same file produces constant disk read activity correlating exactly  
 with the speed in which TCP is sending. Switching to writev(2) or  
 using UFS instead results in expected levels of disk activity.