Усмеряем Clamd

You can edit the clamAV init script (int /etc/init.d/ to add the command ulimit -m amountofram.
It will limitate the possibility of clamAV and you will probably swap which will probably slow down your whole system.

The specified services are then started by running the corresponding service initialization scripts located in /etc/rc.d/ and /usr/local/etc/rc.d/. These scripts are similar to the scripts located in /etc/init.d/ on Linux® systems.

#!/bin/sh
#
# $FreeBSD: ports/security/clamav/files/clamav-clamd.in,v 1.7 2009/07/15 16:56:01 dougb Exp $
#

# PROVIDE: clamd
# REQUIRE: LOGIN
# BEFORE: mail
# KEYWORD: shutdown

#
# Add the following lines to /etc/rc.conf to enable clamd:
#
# clamav_clamd_enable="YES"
# clamav_clamd_flags="<set as needed>"
#
# See clamd(8) for flags
#

. /etc/rc.subr



name=clamav_clamd
rcvar=`set_rcvar`

ulimit -f 100000

command=/usr/local/sbin/clamd
required_dirs=/var/db/clamav
required_files=/usr/local/etc/clamd.conf

# read settings, set default values
load_rc_config "$name"
: ${clamav_clamd_enable="NO"}
: ${clamav_clamd_socket="/var/run/clamav/clamd.sock"}

start_precmd=clamav_clamd_precmd

#clamav .93 won't start without a valid main.c[vl]d file
clamav_clamd_precmd() {
	if [ ! -f /var/db/clamav/main.cvd -a ! -f /var/db/clamav/main.cld ];then
		echo "Missing /var/db/clamav/clamav/*.cvd or *.cld files.  You must run freshclam first"
		exit 1
	fi
}

extra_commands="reload"
reload_cmd=clamd_reload

clamd_reload()
{
  /usr/local/bin/clamdscan --reload
}

run_rc_command "$1"