將路由器作下載器有時會遇到內存居高不下，需要添加虛擬內存做后援。一般虛擬內存設為32M 或64M即可，再大沒有意義，拖慢速度。如果實在不明白此腳本的功能，何須介意，不必強開。

按照下面的教程，先開啟路由器的SSH和JFFS功能。

一、軟配置：

1）登錄路由器，進入【系統管理】設置頁面

2）進入【系統設置】選項，打開JFFS2和SSH功能 

3）下拉到底，應用設置后，重啟路由器生效。

4）下載WinSCP  （點我下載  密碼：6q52）

5）輸入路由器IP,SCP協議，用戶名、密碼登錄

6）進入路由器主目錄/

7)進入 /jffs/scripts/目錄

8）新建文件

9）文件名sdaswap，注意更改編碼格式為UTF-8，否則后面會提示無此文件。

10）選擇UTF-8編碼，然后將下面腳本代碼復制到編輯器，并保存

#!/bin/sh R_BOLD="" G_BOLD="" BOLD="" NORM="" INFO="$BOLD Info: $NORM" ERROR="$BOLD *** Error: $NORM" INPUT="$BOLD => $NORM"  SWAP_FILE=`nvram get apps_swap_file` SWAP_SIZE=`nvram get apps_swap_size` i=1 cd /tmp  echo -e "$INFO This script will guide you through the swap installation." echo -e "$INFO Script modifies "swap" folder only on the chosen drive,"  echo -e "$INFO Looking for available partitions..." for mounted in `/bin/mount |awk '{if($0 ~/mnt/){ print $3}}'` ; do   echo -e "$G_BOLD [$i] --> $mounted $NORM"   eval mounts$i=$mounted   i=`expr $i + 1` done  if [ $i == "1" ] ; then   echo -e "$ERROR $R_BOLD No partitions available. Exiting...$NORM"   exit 1 fi  echo -en "$INPUT $BOLD Please enter partition number or 0 to exit $NORM $BOLD[0-`expr $i - 1`]$NORM: " read partitionNumber if [ "$partitionNumber" == "0" ] ; then   echo -e $INFO Exiting...   exit 0 fi if [ "$partitionNumber" = "" ] || [ "`echo $partitionNumber|sed 's/[0-9]//g'`" != "" ] ; then     echo -e "$ERROR $R_BOLD Invalid arguments! Exiting...$NORM"   exit 1 fi if [ "$partitionNumber" -gt `expr $i - 1` ] ; then   echo -e "$ERROR $R_BOLD Invalid partition number! Exiting...$NORM"   exit 1 fi  eval entPartition=$mounts$partitionNumber echo -e "$INFO $G_BOLD $entPartition $NORM selected." APPS_INSTALL_PATH=$entPartition/swap  case "$1" in   start)  mem_size=`free |awk '$0 ~/Swap/{print $4}'` pool_size=`df |awk '{if($0 ~"'$entPartition'") {print $4}}'` if [ $pool_size -gt $SWAP_SIZE ]; then         [ -e "$APPS_INSTALL_PATH/$SWAP_FILE" ] && swapoff $APPS_INSTALL_PATH/$SWAP_FILE         [ -d "$APPS_INSTALL_PATH" ] && rm -rf $APPS_INSTALL_PATH         echo -e "$INFO Creating $APPS_INSTALL_PATH folder..."         mkdir -p $APPS_INSTALL_PATH         echo -en "$INFO Swap size is [$BOLD$SWAP_SIZE$NORM],changed:c $BOLD"         read answer         if [ "$answer" = "" ]         then         {         echo -e "$INFO Swap size was not changed"         }         else         {              if [ "$answer" != "" ] && [ "`echo $answer|sed 's/[0-9]//g'`" = "" ] && [ $answer -lt $pool_size ]              then              {                   SWAP_SIZE=$answer                                                                                     echo -en "$INFO Swap size was changed $BOLD[$SWAP_SIZE]$NORM  "              }             else             {                   echo -e "$ERROR $R_BOLD Invalid arguments $NORM"                   exit 1             }             fi         }         fi        swap_count=`expr $SWAP_SIZE / 1000 - 1`        echo -e "$INFO dd if=/dev/zero of=$APPS_INSTALL_PATH/$SWAP_FILE bs=1M count=$swap_count"        dd if=/dev/zero of=$APPS_INSTALL_PATH/$SWAP_FILE bs=1M count=$swap_count        echo -e "$INFO mkswap $APPS_INSTALL_PATH/$SWAP_FILE"        mkswap $APPS_INSTALL_PATH/$SWAP_FILE        echo -e "$INFO $G_BOLD swapon $APPS_INSTALL_PATH/$SWAP_FILE $NORM"        swapon $APPS_INSTALL_PATH/$SWAP_FILE        echo -e "**********************************************************"         echo -e "  ${G_BOLD}Swap:$NORM  Total($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $2}')$NORM)  Used($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $3}')$NORM)  Free($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $4}')$NORM)"        echo -e "**********************************************************"        fi        echo -e "$INFO Create boot entry, y? :c "        read yor        if [ "$yor" = "y" ]         then        {        [ -e "/jffs/scripts/services-start" ] && [ `cat /jffs/scripts/services-start |awk '{if($0 ~/swapon/) {print $0}}'|wc -l` -ge 1 ] &&        sed -i 'N;/ .*swapon/!P;D' /jffs/scripts/services-start && sed -i '/swapon/d' /jffs/scripts/services-start         [ ! -e "/jffs/scripts/services-start" ] && echo "#!/bin/sh" > /jffs/scripts/services-start        [ `grep "#!/bin/sh" /jffs/scripts/services-start |wc -l` -lt 1 ] && sed -i '1i#!/bin/sh' /jffs/scripts/services-start        sed -i '1asleep 30' /jffs/scripts/services-start        sed -i '2aswapon '$APPS_INSTALL_PATH'/'$SWAP_FILE'' /jffs/scripts/services-start            chmod 755 /jffs/scripts/services-start        echo -e "$INFO $G_BOLD Boot entry is created $NORM"        }        else        {        echo -e "$INFO $G_BOLD Boot entry was not created,Exiting $NORM"        exit 1        }        fi        ;;   stop)        [ -e "/jffs/scripts/services-start" ] && [ `cat /jffs/scripts/services-start |awk '{if($0 ~/swapon/) {print $0}}'|wc -l` -ge 1 ] &&        sed -i 'N;/ .*swapon/!P;D' /jffs/scripts/services-start && sed -i '/swapon/d' /jffs/scripts/services-start        [ -e "$APPS_INSTALL_PATH/$SWAP_FILE" ] && swapoff $APPS_INSTALL_PATH/$SWAP_FILE                                [ -d "$APPS_INSTALL_PATH" ] && rm -rf $APPS_INSTALL_PATH               echo -e "**********************************************************"         echo -e "  ${G_BOLD}Swap:$NORM  Total($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $2}')$NORM)  Used($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $3}')$NORM)  Free($G_BOLD$(free |grep -A1 "Swap" |awk   '{print $4}')$NORM)"        echo -e "**********************************************************"        ;;   *)   exit 1   ;; esac

11）在sdaswap文件右擊鼠標，屬性。設置為0755權限 （該權限是可讀寫、執行）
到此可以關閉WinSCP軟件。

二、執行命令

1）進入路由器的軟件中心 Software Center 安裝shellinabox命令工具
輸入用戶名和密碼登錄

2）運行命令行：/jffs/scripts/sdaswap start
注意“start”的參數不可少.

3）腳本自動掃描路由器外接的USB設備，列出所有存儲類設備供選擇使用哪個USB硬盤作為虛擬內存的載體。
支持NTFSEXT2,3,4
注意：建議使用高速U盤或者SSD硬盤，虛擬內存類似于普通內存，需要多次高速讀寫，整體速度取決于USB設備的速度。這里可以選擇虛擬內存的大小，默認為33000=32M，可以設置為64M=>65500。如果沒有特殊需求，建議使用默認大小。并不是越大越好，更大的內存容量 可能會拖慢系統速度。

4）加載成功后，自動加載Swap的信息。Total是總緩存，Used 已使用，Free未使用
如果Total顯示為0證明沒有加載成功或者已關閉虛擬內存功能。
最后一行是提示是否加載到開機啟動項。y回車是添加到啟動項。

5）停用虛擬內存功能命令：/jffs/scripts/sdaswap stop
掃描USB設備，選擇要停用哪個設備的虛擬內存。Swap: Total顯示0，證明已經停用虛擬內存

下面是增加虛擬內存前后的結果圖