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在現(xiàn)代企業(yè)中，網(wǎng)絡(luò)性能是影響業(yè)務(wù)運(yùn)行的關(guān)鍵因素之一，Linux作為一款穩(wěn)定、高效的操作系統(tǒng)，廣泛應(yīng)用于各種服務(wù)器場(chǎng)景，掌握如何使用Linux進(jìn)行網(wǎng)絡(luò)性能調(diào)優(yōu)是非常重要的，本文將從以下幾個(gè)方面介紹如何使用Linux進(jìn)行網(wǎng)絡(luò)性能調(diào)優(yōu)：

1、網(wǎng)絡(luò)參數(shù)調(diào)優(yōu)

2、系統(tǒng)內(nèi)核參數(shù)調(diào)優(yōu)

3、網(wǎng)絡(luò)設(shè)備調(diào)優(yōu)

4、應(yīng)用程序調(diào)優(yōu)

網(wǎng)絡(luò)參數(shù)調(diào)優(yōu)

1、修改TCP參數(shù)

TCP參數(shù)對(duì)網(wǎng)絡(luò)性能有很大影響，可以通過(guò)修改/etc/sysctl.conf文件來(lái)調(diào)整TCP參數(shù)，可以增加以下內(nèi)容來(lái)提高TCP連接的并發(fā)能力：

net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_rmem = 4096 87380 67108864
net.ipv4.tcp_wmem = 4096 65536 67108864
net.ipv4.tcp_window_scaling = 1

修改完成后，執(zhí)行以下命令使配置生效：

sysctl p

2、啟用GRO（Generic Receive Offload）和TSO（TCP Segmentation Offload）

GRO和TSO可以提高網(wǎng)絡(luò)設(shè)備的處理能力，從而提高網(wǎng)絡(luò)性能，可以通過(guò)以下命令啟用GRO和TSO：

echo "net.ipv4.tcp_rmem = 90000000 90000000 90000000" >> /etc/sysctl.conf
echo "net.ipv4.tcp_wmem = 90000000 90000000 90000000" >> /etc/sysctl.conf
echo "net.ipv4.tcp_window_scaling = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_timestamps = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_sack = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_no_metrics_save = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_moderate_rcvbuf = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_rfc1337 = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_fastopen = 3" >> /etc/sysctl.conf
sysctl p

系統(tǒng)內(nèi)核參數(shù)調(diào)優(yōu)

1、調(diào)整網(wǎng)絡(luò)緩沖區(qū)大小

通過(guò)調(diào)整網(wǎng)絡(luò)緩沖區(qū)大小，可以提高網(wǎng)絡(luò)性能，可以使用以下命令查看當(dāng)前網(wǎng)絡(luò)緩沖區(qū)大小：

cat /proc/sys/net/core/rmem_default
cat /proc/sys/net/core/wmem_default

根據(jù)實(shí)際需求，可以修改/etc/sysctl.conf文件來(lái)調(diào)整網(wǎng)絡(luò)緩沖區(qū)大小，可以增加以下內(nèi)容來(lái)調(diào)整接收緩沖區(qū)大小：

net.core.rmem_default = 8388608 8388608 8388608
net.core.rmem_max = 16777216 16777216 16777216

修改完成后，執(zhí)行以下命令使配置生效：

sysctl p

2、啟用大頁(yè)內(nèi)存支持

大頁(yè)內(nèi)存可以提高系統(tǒng)性能，可以通過(guò)以下命令啟用大頁(yè)內(nèi)存支持：

echo "vm.nr_hugepages = 256" >> /etc/sysctl.conf
echo "vm.nr_hugepagespersec = 256" >> /etc/sysctl.conf
echo "vm.dirty_background_ratio = 5" >> /etc/sysctl.conf
echo "vm.dirty_ratio = 10" >> /etc/sysctl.conf
echo "vm.dirty_expire_centisecs = 3000" >> /etc/sysctl.conf
echo "vm.dirty_writeback_centisecs = 500" >> /etc/sysctl.conf
echo "vm.dirty_ratio = 2" >> /etc/sysctl.conf
echo "vm.dirty_expire_centisecs = 300" >> /etc/sysctl.conf
echo "vm.dirty_writeback_centisecs = 150" >> /etc/sysctl.conf
sysctl p

網(wǎng)絡(luò)設(shè)備調(diào)優(yōu)

1、調(diào)整交換機(jī)端口速率和雙工模式

根據(jù)實(shí)際需求，可以調(diào)整交換機(jī)端口速率和雙工模式，可以將某個(gè)端口速率設(shè)置為1Gbps，雙工模式設(shè)置為半雙工：

switchport speed 1g fullduplex negotiation off forcespeed 1g duplex half autoneg off forceduplex half portsecurity maximum 1 vlanfiltering all enable portsecurity aging time 2 minutes portsecurity maxattempts 2 violation restrict portsecurity aging type inactivity logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login login lockout threshold warning level alert action message logout local logout reauthentication login disable devicelock password cisco login login lockout threshold warning level alert action message logout

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