Paris, France (CNN) -- The French Senate adopted new rules Thursday to speed up voting on a controversial pension reform bill that has sent more than a million people onto the streets in protest.
Protesters march against the French government's austerity measures
Thousands of people demonstrated in central Paris on Thursday as protesters and lawmakers went down to the wire in a battle over the bill. Protest leaders said they planned to march close to the Senate.
Lawmakers, trying to wade through more than 1,000 amendments -- many put up by opposition senators to try to derail the bill -- will group them together rather than voting on each one, Labor Minister Eric Woerth announced.
He said debate on the bill had gone on longer than on any other law since the Fifth Republic came into existence in 1958.
The bill would raise the retirement age from 60 to 62, among other changes.
About 4,000 people -- mostly students -- were out demonstrating against it on Thursday, police estimated.
The march was largely peaceful, CNN's Phil Black at the scene reported, although there were confrontations between students on the one hand and riot police and undercover police in the crowd on the other.
The protesters marched through the city, blocking intersections as they headed for Denfert Rochereau, a central Paris square that has seen many demonstrations over the years.
Some 200 demonstrators blocked France's Marseille Provence Airport for more than three hours Thursday as strikes and protests continued across the country, trade unions said.
But some people are losing patience with the demonstrators, some of whom are causing fuel shortages.
A middle-aged woman who said she had been looking for gas for her motorcycle for an hour said people have "had enough."
"We are really sick of these idiots who are turning our country upside down. We have had enough of all these horrible trade unions that are messing up this country. That is all I have to say," said the woman, who refused to give her name.
The country continues to face some fuel shortages because workers are on strike at all 12 of the nation's refineries, and protesters are blocking 14 of the country's 219 oil terminals.
Pop star Lady Gaga postponed two Paris shows this weekend because of "the logistical difficulties due to the strikes," her website said.
"Unfortunately, as there is no certainty that the trucks can make it to the Bercy for this weekend's shows, the Lady Gaga performances are now postponed," the statement said.
The French Senate is working its way through roughly 1,000 amendments to the pension reform bill, and a final vote on the bill could come as early as Thursday or as late as Sunday.
The lower house of parliament has already passed it, by a vote of 329 to 233.
If there are substantial differences between the Senate and National Assembly versions, a conference committee will have to iron them out before the final version goes to President Nicolas Sarkozy.
France has been reeling from the strikes. Police and protesters clashed Wednesday, and on Tuesday, 428 people were arrested in connection with the demonstrations.
About 1.1 million people demonstrated across the country on Tuesday, French media quoted police as saying. Unions put the figure at 3.5 million nationwide that day.
The ongoing strike follows a series of one-day strikes this month and last month. The strikers have crippled transportation, and affected schools and fuel supplies.
Students from high schools have been skipping classes to join the protests. Some students told CNN in Paris that they are worried they won't be able to get jobs if the current generation hangs onto jobs for an extra two years.
French authorities unblocked three fuel depots Wednesday after the president ordered police to break blockades by strikers.
"We did it because the west of France is threatened by a very severe shortage of fuel. The opening of these three depots was essential and will gradually allow normal activity to resume," Interior Minister Brice Hortefeux said.
The French government contends that the country cannot afford the earlier retirement payments.
"I will implement the pension reform because my duty as head of state is to ensure that French people and their children can count on retirement and that the amount they receive will be maintained," Sarkozy said Wednesday.
Resource from: CNN